Floating and Sinking

Relative Density Determination

By the end of the lesson, the learner should be able to:
Define relative density of solids and liquids; Use Archimedes' principle to determine relative density; Apply the formula: RD = Weight in air/(Weight in air - Weight in fluid); Solve Examples 8, 9, 10, 11, and 12 from textbook; Calculate relative density using different methods

Review of density concepts through Q/A; Introduction to relative density using practical examples; Mathematical derivation of relative density formulae; Step-by-step solution of Examples 8-12; Practical determination of relative density for various materials; Group calculations and comparisons

Spring balance; Various solid objects; Different liquids; Measuring cylinders; Calculators; Examples from textbook; Objects of unknown density; Data recording sheets

KLB Secondary Physics Form 4, Pages 69-74

Floating and Sinking

Archimedes' Principle and Moments

By the end of the lesson, the learner should be able to:
Perform Experiment 3.3 determining relative density using moments; Understand the principle of moments in relative density determination; Plot graphs of d₁ against d₂ and determine slopes; Apply moments method to determine relative density of liquids; Explain advantages of moments method over direct weighing

Q/A on relative density calculations; Setup and performance of Experiment 3.3 - relative density using moments; Data collection and graph plotting; Analysis of graph slopes and their significance; Application to liquids determination; Discussion of method advantages and accuracy

Metre rule; Clamps and stands; Solid objects; Metal blocks; Water and other liquids; Graph paper; Calculators; Data recording tables; Balance setup materials

KLB Secondary Physics Form 4, Pages 71-74

Floating and Sinking

Applications - Hydrometer and Practical Instruments

By the end of the lesson, the learner should be able to:
Explain the working principle of hydrometers; Describe structure and features of practical hydrometers; Solve Examples 12 and 13 involving hydrometer calculations; Understand applications in measuring density of milk, battery acid, and beer; Calculate hydrometer dimensions and floating positions

Review of law of flotation through Q/A; Detailed study of hydrometer structure and operation; Analysis of hydrometer sensitivity and design features; Step-by-step solution of Examples 12-13; Discussion of specialized hydrometers (lactometer, battery acid hydrometer); Practical calculations involving hydrometer floating

Hydrometer (if available); Different density liquids; Measuring cylinders; Calculators; Examples from textbook; Charts showing hydrometer types; Battery acid hydrometer demonstration

KLB Secondary Physics Form 4, Pages 74-77

Floating and Sinking

Applications - Hydrometer and Practical Instruments

By the end of the lesson, the learner should be able to:
Explain the working principle of hydrometers; Describe structure and features of practical hydrometers; Solve Examples 12 and 13 involving hydrometer calculations; Understand applications in measuring density of milk, battery acid, and beer; Calculate hydrometer dimensions and floating positions

Review of law of flotation through Q/A; Detailed study of hydrometer structure and operation; Analysis of hydrometer sensitivity and design features; Step-by-step solution of Examples 12-13; Discussion of specialized hydrometers (lactometer, battery acid hydrometer); Practical calculations involving hydrometer floating

Hydrometer (if available); Different density liquids; Measuring cylinders; Calculators; Examples from textbook; Charts showing hydrometer types; Battery acid hydrometer demonstration

KLB Secondary Physics Form 4, Pages 74-77

Floating and Sinking
Thin Lenses

Applications - Ships, Submarines, and Balloons
Types of Lenses and Effects on Light

By the end of the lesson, the learner should be able to:
Explain how steel ships float on water; Describe working principle of submarines; Understand how balloons achieve lift and control altitude; Analyze the role of displaced fluid in each application; Apply principles to solve practical problems involving floating vessels

Q/A on hydrometer applications; Analysis of ship design and floating principles; Detailed study of submarine operation and ballast tanks; Exploration of balloon physics and gas density effects; Discussion of load limits and stability; Problem-solving involving practical floating applications

Model ships and submarines; Balloon demonstrations; Charts showing ship cross-sections; Submarine ballast tank models; Different density materials; Calculators; Application examples
Ray box; Various convex and concave lenses; White screen; Plane mirror; Card with parallel slits; Sunlight or strong lamp

KLB Secondary Physics Form 4, Pages 77

Thin Lenses

Definition of Terms and Ray Diagrams

By the end of the lesson, the learner should be able to:
Define centre of curvature, principal axis, optical centre, principal focus and focal length; Distinguish between real and virtual focus; State and apply the three important rays for lens diagrams; Construct basic ray diagrams for lenses

Q/A review of lens effects; Guided discovery of lens terminology using practical demonstrations; Step-by-step construction of ray diagrams using the three important rays; Practice drawing ray paths for parallel rays, rays through focus, and rays through optical centre; Group work on ray diagram construction

Various lenses; Rulers; Graph paper; Ray boxes; Charts showing lens terminology; Drawing materials; Laser pointers (if available)

KLB Secondary Physics Form 4, Pages 3-8

Thin Lenses

Image Formation by Converging Lenses
Image Formation by Diverging Lenses and Linear Magnification

By the end of the lesson, the learner should be able to:
Locate images for different object positions using ray diagrams; Describe image characteristics (real/virtual, erect/inverted, magnified/diminished); Explain applications in telescope, camera, projector and magnifying glass; Understand relationship between object position and image properties

Review of ray construction rules; Systematic ray diagram construction for objects at infinity, beyond 2F, at 2F, between F and 2F, at F, and between F and lens; Analysis of image characteristics for each position; Discussion of practical applications; Demonstration using lens, object and screen

Converging lenses; Objects; White screen; Metre rule; Candle; Graph paper; Charts showing applications; Camera (if available)
Diverging lenses; Graph paper; Rulers; Calculators; Examples from textbook; Objects of known heights; Measuring equipment

KLB Secondary Physics Form 4, Pages 8-12

Thin Lenses

The Lens Formula
Determination of Focal Length I

By the end of the lesson, the learner should be able to:
Derive the lens formula using similar triangles; Understand and apply the Real-is-positive sign convention; Use the lens formula to solve problems involving object distance, image distance and focal length; Solve Examples 4, 5, 6, and 7 from textbook

Review of magnification concepts; Mathematical derivation of lens formula from similar triangles; Introduction to sign convention rules; Step-by-step solution of Examples 4-7; Practice problems applying lens formula to various situations; Group work on formula applications

Mathematical instruments; Charts showing derivation; Calculators; Worked examples; Sign convention chart; Practice worksheets
Converging lenses; Lens holders; Metre rule; White screen; Distant objects; Plane mirror; Pins; Cork; Glass rod; Light source; Cardboard with cross-wires

KLB Secondary Physics Form 4, Pages 14-20

Thin Lenses

Determination of Focal Length II
Power of Lens and Simple Microscope

By the end of the lesson, the learner should be able to:
Determine focal length using lens formula method (Experiment 1.4); Plot and analyze 1/u vs 1/v graphs; Determine focal length from displacement method (Experiment 1.5); Solve Examples 8, 9, and 10 involving graphical methods

Review of previous focal length methods; Setup and performance of Experiment 1.4; Data collection and graph plotting; Analysis of Examples 8-10; Introduction to displacement method and conjugate points; Practical work with different graphical approaches

Experimental setup materials; Graph paper; Calculators; Data tables; Examples 8-10 from textbook; Materials for displacement method
Various lenses of different focal lengths; Magnifying glasses; Small objects; Calculators; Power calculation charts; Small print materials; Biological specimens

KLB Secondary Physics Form 4, Pages 19-25

Thin Lenses

Compound Microscope

By the end of the lesson, the learner should be able to:
Describe structure and working of compound microscope; Explain functions of objective lens and eyepiece; Calculate total magnification; Solve Example 11 involving lens separation; Understand normal adjustment of compound microscope

Review of simple microscope; Introduction to compound microscope structure; Ray tracing through objective and eyepiece; Mathematical analysis of total magnification; Step-by-step solution of Example 11; Practical demonstration with microscope parts

Compound microscope; Charts showing microscope structure; Lenses representing objective and eyepiece; Calculators; Example 11 from textbook; Ray tracing materials

KLB Secondary Physics Form 4, Pages 28-30

Thin Lenses

The Human Eye

By the end of the lesson, the learner should be able to:
Describe structure of human eye and functions of each part; Explain accommodation process and role of ciliary muscles; Define near point and far point; Understand how eye focuses at different distances; Compare eye structure with camera

Introduction to human eye as natural optical instrument; Detailed study of eye structure using charts/models; Demonstration of accommodation using flexible lens model; Practical measurement of near and far points; Comparison table of eye vs camera similarities and differences

Charts/models of human eye; Torch for demonstrations; Eye model with flexible lens; Objects at various distances; Measuring equipment; Camera comparison charts

KLB Secondary Physics Form 4, Pages 30-32

Thin Lenses

Defects of Vision

By the end of the lesson, the learner should be able to:
Describe short sight (myopia) and its causes; Explain correction of myopia using diverging lenses; Describe long sight (hypermetropia) and its causes; Explain correction of hypermetropia using converging lenses; Draw ray diagrams showing defects and their corrections

Q/A on normal vision and accommodation; Analysis of myopia - causes, effects, and correction; Ray diagrams for uncorrected and corrected myopia; Study of hypermetropia - causes, effects, and correction; Ray diagrams for uncorrected and corrected hypermetropia; Demonstration using appropriate lenses

Charts showing vision defects; Converging and diverging lenses; Eye models; Spectacles with different lenses; Vision test materials; Ray diagram materials

KLB Secondary Physics Form 4, Pages 32-33

Thin Lenses

The Camera and Applications Review

By the end of the lesson, the learner should be able to:
Describe camera structure and working principles; Explain functions of camera lens, shutter, aperture, and film; Compare camera with human eye highlighting similarities and differences; Review all applications of lenses in optical instruments

Review of optical instruments studied; Analysis of camera components and their functions; Detailed comparison of camera and eye; Discussion of focusing mechanisms; Comprehensive review of lens applications in telescope, microscope, camera, spectacles, and magnifying glass

Camera (if available); Charts showing camera structure; Comparison tables; Review charts of all applications; Summary materials; Demonstration equipment

KLB Secondary Physics Form 4, Pages 33-35

Thin Lenses

The Camera and Applications Review

By the end of the lesson, the learner should be able to:
Describe camera structure and working principles; Explain functions of camera lens, shutter, aperture, and film; Compare camera with human eye highlighting similarities and differences; Review all applications of lenses in optical instruments

Review of optical instruments studied; Analysis of camera components and their functions; Detailed comparison of camera and eye; Discussion of focusing mechanisms; Comprehensive review of lens applications in telescope, microscope, camera, spectacles, and magnifying glass

Camera (if available); Charts showing camera structure; Comparison tables; Review charts of all applications; Summary materials; Demonstration equipment

KLB Secondary Physics Form 4, Pages 33-35

Electromagnetic Induction

Introduction and Historical Background

By the end of the lesson, the learner should be able to:
Define electromagnetic induction and its significance; Explain Faraday's discovery and its impact on modern technology; Understand the relationship between magnetism and electricity; Identify examples of electromagnetic induction in daily life; Appreciate the importance of relative motion in electromagnetic phenomena

Q/A on magnetic fields and electric current relationships from previous studies; Introduction to Michael Faraday's discovery and its historical significance; Discussion of electromagnetic induction examples in daily life (generators, transformers, motors); Overview of chapter content and learning objectives; Introduction to practical applications in power generation and electronics

Charts showing Faraday's experiments; Pictures of power stations; Transformers; Generators; Historical timeline of electromagnetic discoveries; Real-world applications display

KLB Secondary Physics Form 4, Pages 86

Electromagnetic Induction

Conditions for Electromagnetic Induction - Straight Conductor

By the end of the lesson, the learner should be able to:
Perform Experiment 5.1 using straight conductor; Identify conditions necessary for inducing e.m.f. in a straight conductor; Observe effects of different types of motion on induced current; Understand the importance of relative motion between conductor and magnetic field; Analyze galvanometer deflections

Performance of Experiment 5.1 using straight conductor AB in U-shaped magnet; Systematic investigation of conductor movement (vertical up/down, parallel to field, stationary, different angles); Observation and recording of galvanometer deflections; Analysis of current direction changes with motion reversal; Discussion of relative motion importance and field cutting concept

Thick electric conductor; U-shaped magnet; Galvanometer; Connecting wires; Clamp and stand setup; Data recording sheets

KLB Secondary Physics Form 4, Pages 86-87

Electromagnetic Induction

Conditions for Electromagnetic Induction - Coils

By the end of the lesson, the learner should be able to:
Perform Experiment 5.1 using coils; Compare induction effects in straight conductors vs coils; Observe effects of magnet movement into and out of coils; Understand flux linkage concept; Analyze why coils are more effective than single conductors

Continuation of Experiment 5.1 using coil instead of straight conductor; Investigation of magnet movement into coil, out of coil, and stationary positions; Comparison of deflection magnitudes between straight conductor and coil setups; Analysis of why coils produce larger induced e.m.f.; Discussion of magnetic flux and flux linkage concepts

Coils of different sizes; Magnets of various strengths; Galvanometer; Connecting wires; Comparison data sheets

KLB Secondary Physics Form 4, Pages 87-88

Electromagnetic Induction

Factors Affecting Induced E.M.F. - Rate of Change

By the end of the lesson, the learner should be able to:
Perform Experiment 5.2 investigating rate of change effects; Understand relationship between speed of motion and induced e.m.f.; Collect and analyze data on rate of flux change; Establish that faster changes produce larger e.m.f.; Apply findings to practical situations

Performance of Experiment 5.2 investigating relationship between rate of change of magnetic flux and induced e.m.f.; Systematic variation of magnet withdrawal speeds (very fast, moderate, very slow); Recording and comparison of galvanometer deflections; Data analysis and conclusion drawing; Discussion of practical implications in generators and other applications

Coil of at least 50 turns; Sensitive galvanometer; Magnet; Stopwatch; Data collection tables; Graph paper for analysis

KLB Secondary Physics Form 4, Pages 88-89

Electromagnetic Induction

Factors Affecting Induced E.M.F. - Magnetic Field Strength

By the end of the lesson, the learner should be able to:
Perform Experiment 5.3 investigating magnetic field strength effects; Understand relationship between field strength and induced e.m.f.; Control variables in electromagnetic experiments; Use electromagnets to vary field strength; Apply experimental findings to solve problems

Performance of Experiment 5.3 investigating relationship between magnetic field strength and induced e.m.f.; Setup of electromagnet with variable current control; Investigation of wire PQ movement in different field strengths; Recording galvanometer deflections for different electromagnet currents; Analysis of results and relationship establishment

U-shaped electromagnet; Variable resistor; Wire PQ; Galvanometer; Ammeter; Connecting wires; Power supply; Data recording materials

KLB Secondary Physics Form 4, Pages 89

Electromagnetic Induction

Factors Affecting Induced E.M.F. - Magnetic Field Strength

By the end of the lesson, the learner should be able to:
Perform Experiment 5.3 investigating magnetic field strength effects; Understand relationship between field strength and induced e.m.f.; Control variables in electromagnetic experiments; Use electromagnets to vary field strength; Apply experimental findings to solve problems

Performance of Experiment 5.3 investigating relationship between magnetic field strength and induced e.m.f.; Setup of electromagnet with variable current control; Investigation of wire PQ movement in different field strengths; Recording galvanometer deflections for different electromagnet currents; Analysis of results and relationship establishment

U-shaped electromagnet; Variable resistor; Wire PQ; Galvanometer; Ammeter; Connecting wires; Power supply; Data recording materials

KLB Secondary Physics Form 4, Pages 89

Electromagnetic Induction

Factors Affecting Induced E.M.F. - Number of Turns

By the end of the lesson, the learner should be able to:
Perform Experiment 5.4 investigating effect of coil turns; Understand relationship between number of turns and induced e.m.f.; Construct coils with different numbers of turns; Analyze why more turns produce larger e.m.f.; State Faraday's law of electromagnetic induction

Performance of Experiment 5.4 investigating relationship between number of turns and induced e.m.f.; Construction of solenoids with 60, 50, 40, 30, and 20 turns; Systematic testing with same magnet withdrawal speed; Recording and analysis of galvanometer readings; Mathematical relationship establishment; Statement of Faraday's law based on experimental evidence

Insulated copper wire; Sensitive galvanometer; Magnet; Connecting wires; Wire cutting and measuring tools; Data analysis sheets

KLB Secondary Physics Form 4, Pages 89-90

Electromagnetic Induction

Lenz's Law and Direction of Induced Current

By the end of the lesson, the learner should be able to:
Perform Experiment 5.5 determining direction of induced current; State Lenz's law and explain its significance; Understand energy conservation in electromagnetic induction; Predict current direction using Lenz's law; Relate Lenz's law to conservation of energy principle

Performance of Experiment 5.5(a) establishing galvanometer deflection direction; Performance of Experiment 5.5(b) investigating induced current direction with magnet movement; Analysis of current directions and magnetic pole formation; Statement and explanation of Lenz's law; Discussion of energy conservation and opposition principle; Practice in predicting current directions

Variable resistor; Sensitive center-zero galvanometer; Connecting wires; Coil; Magnet; Switch; Battery; Direction analysis charts

KLB Secondary Physics Form 4, Pages 90-93

Electromagnetic Induction

Fleming's Right-Hand Rule

By the end of the lesson, the learner should be able to:
Perform Experiment 5.6 with straight conductors; State Fleming's right-hand rule (dynamo rule); Apply the rule to determine direction of induced current; Understand relationship between motion, field, and current directions; Solve Example 1 involving square loop movement

Performance of Experiment 5.6 determining induced current direction in straight conductor; Introduction and demonstration of Fleming's right-hand rule; Practice applying the rule to various conductor movements; Step-by-step solution of Example 1 (square loop in magnetic field); Analysis of current directions in different parts of the loop; Verification of Fleming's rule consistency with Lenz's law

U-shaped magnet; Thick wire AB; Marked center-zero galvanometer; Hand models for rule demonstration; Example 1 setup materials; Direction analysis worksheets

KLB Secondary Physics Form 4, Pages 93-97

Electromagnetic Induction

Applications of Induction Laws

By the end of the lesson, the learner should be able to:
Solve Examples 2 and 3 involving current direction; Apply Lenz's law to predict current directions in circuits; Understand induced current effects in neighboring circuits; Analyze changing magnetic fields and their effects; Use both Fleming's rule and Lenz's law in problem solving

Q/A review of Fleming's rule and Lenz's law; Step-by-step solution of Example 2 (current in conductor AB affecting nearby loop); Detailed analysis of Example 3 (magnet movement and coil current direction); Practice problems involving current direction prediction; Group work on applying both laws to various scenarios; Discussion of consistency between different methods

Examples 2 and 3 setup materials; Problem-solving worksheets; Charts showing current direction analysis; Group work materials; Calculators

KLB Secondary Physics Form 4, Pages 94-97

Electromagnetic Induction

Mutual Induction

By the end of the lesson, the learner should be able to:
Define mutual induction and demonstrate its occurrence; Perform Experiment 5.7 showing mutual induction between coils; Explain factors affecting mutual induction; Understand primary and secondary coil relationships; Discuss enhancement methods using iron cores

Q/A on electromagnetic induction principles; Introduction to mutual induction concept and definition; Performance of Experiment 5.7 demonstrating mutual induction between primary and secondary coils; Investigation of switching effects, current changes, and A.C. source effects; Analysis of mutual induction enhancement using soft iron rod and ring; Discussion of applications in transformers

Two coils P and S; Galvanometer; Battery; A.C. power source; Switch; Rheostat; Connecting wires; Soft iron rod; Soft iron ring; Enhancement demonstration materials

KLB Secondary Physics Form 4, Pages 97-100

Electromagnetic Induction

Transformers - Basic Principles

By the end of the lesson, the learner should be able to:
Describe transformer structure and components; Explain working principle based on mutual induction; Perform Experiment 5.10 investigating secondary e.m.f. variation; Understand primary and secondary coil functions; Distinguish between step-up and step-down transformers

Review of mutual induction through Q/A; Introduction to transformer structure (primary coil, secondary coil, iron core); Performance of Experiment 5.10 - variation of secondary e.m.f. with number of turns; Observation of bulb brightness changes with turn variations; Analysis of step-up vs step-down transformer characteristics; Introduction to transformer symbols and representations

Long insulated copper wire; Soft iron rod; Low frequency A.C. source; A.C. voltmeter; Switch; Bulb; Transformer construction materials; Symbol charts

KLB Secondary Physics Form 4, Pages 100-102

Electromagnetic Induction

Transformers - Basic Principles

By the end of the lesson, the learner should be able to:
Describe transformer structure and components; Explain working principle based on mutual induction; Perform Experiment 5.10 investigating secondary e.m.f. variation; Understand primary and secondary coil functions; Distinguish between step-up and step-down transformers

Review of mutual induction through Q/A; Introduction to transformer structure (primary coil, secondary coil, iron core); Performance of Experiment 5.10 - variation of secondary e.m.f. with number of turns; Observation of bulb brightness changes with turn variations; Analysis of step-up vs step-down transformer characteristics; Introduction to transformer symbols and representations

Long insulated copper wire; Soft iron rod; Low frequency A.C. source; A.C. voltmeter; Switch; Bulb; Transformer construction materials; Symbol charts

KLB Secondary Physics Form 4, Pages 100-102

Electromagnetic Induction

Transformer Equations and Calculations

By the end of the lesson, the learner should be able to:
Derive transformer turns rule equation; Apply transformer equations for voltage and current relationships; Calculate transformer efficiency; Solve Examples 4 and 5 involving transformer problems; Understand ideal vs practical transformer differences

Q/A on transformer working principles; Mathematical derivation of turns rule (Vp/Vs = Np/Ns); Development of current relationship (IpVp = IsVs for ideal transformer); Introduction to efficiency calculations; Step-by-step solution of Examples 4 and 5; Discussion of ideal transformer assumptions vs practical limitations

Calculators; Examples 4 and 5 materials; Mathematical derivation charts; Efficiency calculation worksheets; Transformer specification data

KLB Secondary Physics Form 4, Pages 102-105

Electromagnetic Induction

Transformer Energy Losses and Example 6

By the end of the lesson, the learner should be able to:
Identify four main energy losses in transformers; Explain methods to minimize each type of energy loss; Understand lamination and its purpose; Solve Example 6 involving power transmission system; Calculate efficiency and power losses in practical systems

Review of ideal transformer equations; Analysis of energy losses (flux leakage, copper losses, eddy currents, hysteresis loss); Study of loss minimization techniques including core lamination; Discussion of practical transformer efficiency; Step-by-step solution of Example 6 (complex power transmission system); Analysis of step-up and step-down transformer roles

Charts showing energy losses; Laminated core samples; Example 6 complex setup; Power transmission diagrams; Efficiency calculation materials; Loss minimization demonstration aids

KLB Secondary Physics Form 4, Pages 105-108

Electromagnetic Induction

Applications - Generators, Microphones, and Induction Coils

By the end of the lesson, the learner should be able to:
Explain structure and working of A.C. and D.C. generators; Describe moving-coil microphone operation; Understand induction coil structure and applications; Compare slip rings with split ring commutators; Analyze generator output waveforms and applications

Review of electromagnetic induction in rotating systems; Detailed study of A.C. generator structure and sinusoidal output; Analysis of D.C. generator with split ring commutator; Explanation of moving-coil microphone components and sound conversion; Description of induction coil operation and high voltage generation; Discussion of applications in car ignition systems

A.C. generator model; D.C. generator model; Moving-coil microphone demonstration; Induction coil setup; Output waveform charts; Slip ring and commutator comparisons; Bicycle dynamo

KLB Secondary Physics Form 4, Pages 108-112

Electromagnetic Spectrum

Introduction and Properties of Electromagnetic Waves

By the end of the lesson, the learner should be able to:
Define electromagnetic waves and identify their nature; State properties common to all electromagnetic waves; Arrange electromagnetic radiations in order of wavelength and frequency; Calculate wave properties using c = fλ; Solve Examples 1 and 2 from textbook

Q/A on wave concepts from previous studies; Introduction to electromagnetic waves using everyday examples; Study of electromagnetic spectrum chart; Discussion of wave properties (speed, frequency, wavelength); Mathematical relationship between wave parameters; Solution of Examples 1 and 2 involving calculations

Electromagnetic spectrum charts; Wave demonstration materials; Calculators; Radio; Mobile phone; Examples from textbook; Charts showing wave properties

KLB Secondary Physics Form 4, Pages 79-81

Electromagnetic Spectrum

Production and Detection of Electromagnetic Waves I

By the end of the lesson, the learner should be able to:
Explain production of gamma rays, X-rays, and ultraviolet radiation; Describe detection methods for high-energy radiations; Understand energy transitions in atoms and nuclei; Relate wave energy to frequency using E = hf; Solve Example 3 involving X-ray calculations

Review of electromagnetic properties through Q/A; Study of high-energy radiation production mechanisms; Analysis of detection methods (photographic plates, G-M tubes, fluorescent materials); Discussion of atomic and nuclear energy changes; Step-by-step solution of Example 3; Safety considerations for high-energy radiations

Charts showing radiation production; Photographic film; Fluorescent materials; UV lamp (if available); Geiger counter (if available); Example 3 materials; Safety equipment demonstrations

KLB Secondary Physics Form 4, Pages 81-82

Electromagnetic Spectrum

Production and Detection of Electromagnetic Waves I

By the end of the lesson, the learner should be able to:
Explain production of gamma rays, X-rays, and ultraviolet radiation; Describe detection methods for high-energy radiations; Understand energy transitions in atoms and nuclei; Relate wave energy to frequency using E = hf; Solve Example 3 involving X-ray calculations

Review of electromagnetic properties through Q/A; Study of high-energy radiation production mechanisms; Analysis of detection methods (photographic plates, G-M tubes, fluorescent materials); Discussion of atomic and nuclear energy changes; Step-by-step solution of Example 3; Safety considerations for high-energy radiations

Charts showing radiation production; Photographic film; Fluorescent materials; UV lamp (if available); Geiger counter (if available); Example 3 materials; Safety equipment demonstrations

KLB Secondary Physics Form 4, Pages 81-82

Electromagnetic Spectrum

Production and Detection of Electromagnetic Waves II

By the end of the lesson, the learner should be able to:
Explain production of visible light, infrared, microwaves, and radio waves; Describe detection methods for each radiation type; Understand role of oscillating circuits in radio wave production; Compare detection mechanisms across the spectrum; Demonstrate detection of some radiations

Q/A on high-energy radiations; Study of lower-energy radiation production (thermal, electronic oscillations); Analysis of detection methods (eyes, thermopiles, crystal detectors, radio receivers); Practical demonstrations of infrared detection; Discussion of antenna and oscillating circuit principles; Group identification of sources and detectors

Infrared sources (heaters); Thermometer with blackened bulb; Radio receivers; Microwave oven (demonstration); Oscillating circuit models; Various electromagnetic sources

KLB Secondary Physics Form 4, Pages 81-82

Electromagnetic Spectrum

Applications of Electromagnetic Waves I

By the end of the lesson, the learner should be able to:
Describe medical applications of gamma rays and X-rays; Explain industrial uses of high-energy radiations; Understand applications in sterilization and cancer therapy; Discuss X-ray photography and crystallography; Analyze benefits and limitations of high-energy radiation applications

Review of radiation properties and production; Detailed study of gamma ray applications (sterilization, cancer treatment, flaw detection); Analysis of X-ray applications (medical photography, security, crystallography); Discussion of controlled radiation exposure; Examination of X-ray photographs and medical applications

X-ray photographs; Medical imaging examples; Industrial radiography charts; Cancer treatment information; Sterilization process diagrams; Safety protocol charts

KLB Secondary Physics Form 4, Pages 82-84

Electromagnetic Spectrum

Applications of Electromagnetic Waves II

By the end of the lesson, the learner should be able to:
Explain applications of ultraviolet radiation; Describe uses of visible light in technology; Understand infrared applications in heating and imaging; Analyze microwave applications in cooking and radar; Discuss radio wave applications in communication

Q/A on high-energy radiation applications; Study of UV applications (fluorescence, sterilization, vitamin D, forgery detection); Analysis of visible light uses (photography, optical fibers, lasers); Exploration of infrared applications (heating, night vision, remote controls); Discussion of microwave and radio wave technologies

UV lamp demonstrations; Optical fiber samples; Infrared thermometer; Microwave oven (demonstration); Radio equipment; Remote controls; Radar images; Communication devices

KLB Secondary Physics Form 4, Pages 82-85

Electromagnetic Spectrum

Specific Applications - Radar and Microwave Cooking

By the end of the lesson, the learner should be able to:
Explain principles of radar (radio detection and ranging); Describe microwave oven operation and safety features; Understand reflection and detection in radar systems; Explain how microwaves heat food molecules; Apply wave principles to practical technologies

Review of microwave and radio wave properties; Detailed analysis of radar operation and applications; Study of microwave oven components (magnetron, stirrer, safety features); Discussion of wave reflection and detection principles; Analysis of molecular heating mechanisms; Safety considerations and precautions

Radar system diagrams; Microwave oven cross-section charts; Wave reflection demonstrations; Safety instruction materials; Magnetron information; Aircraft/ship tracking examples

KLB Secondary Physics Form 4, Pages 84-85

Electromagnetic Spectrum

Hazards and Safety Considerations

By the end of the lesson, the learner should be able to:
Identify hazards of high-energy electromagnetic radiations; Explain biological effects of UV, X-rays, and gamma rays; Describe safety measures for radiation protection; Understand delayed effects like cancer and genetic damage; Apply safety principles in radiation use

Q/A on electromagnetic applications; Study of radiation hazards and biological effects; Analysis of skin damage, cell destruction, and genetic effects; Discussion of Chernobyl disaster and radiation accidents; Exploration of safety measures (shielding, distance, time limits); Application of ALARA principle (As Low As Reasonably Achievable)

Radiation hazard charts; Safety equipment demonstrations; Chernobyl disaster information; Biological effect diagrams; Safety protocol materials; Radiation protection examples

KLB Secondary Physics Form 4, Pages 85

Mains Electricity

Sources of Mains Electricity

By the end of the lesson, the learner should be able to:

State the main sources of mains electricity
Explain how different sources generate electrical energy
Compare advantages and disadvantages of different power sources
Describe the environmental impact of various power sources

Prior knowledge review on electrical energy
Discussion on local power sources in Kenya
Field trip planning to nearby power station
Group presentations on different power sources
Q&A session on power generation methods

Pictures of power stations
Charts showing different energy sources
Videos of power generation
Maps of Kenya's power grid
Sample coal, biomass materials

KLB Secondary Physics Form 4, Pages 117

Mains Electricity

The Grid System and Power Transmission
High Voltage Transmission and Power Losses

By the end of the lesson, the learner should be able to:

Define the national grid system
Explain the need for interconnected power stations
Describe high voltage transmission
State the voltage levels in power transmission

Q&A on previous lesson
Drawing and labeling the grid system
Discussion on power transmission in Kenya
Explaining voltage step-up process
Problem-solving on power transmission

Chart of national grid system
Transmission line models
Maps showing power lines
Transformer models
Voltage measurement devices
Calculators
Worked example sheets
Pictures of transmission towers
Safety warning signs
Formula charts

KLB Secondary Physics Form 4, Pages 117-118

Mains Electricity

Domestic Wiring System
Fuses, Circuit Breakers and Safety Devices

By the end of the lesson, the learner should be able to:

Describe the domestic wiring system
Identify components of consumer fuse box
Explain the function of live, neutral and earth wires
Draw simple domestic wiring circuits

Q&A on transmission systems
Examination of house wiring components
Drawing domestic wiring diagrams
Identification of electrical safety features
Practical observation of electrical installations

House wiring components
Fuse box model
Different types of fuses
Electrical cables (samples)
Circuit diagrams
Multimeter
Various fuses (2A, 5A, 13A)
Circuit breakers
Fuse wire samples
Electrical appliances
Calculators
Safety equipment samples

KLB Secondary Physics Form 4, Pages 121-124

Mains Electricity

Ring Mains Circuit and Three-Pin Plugs

By the end of the lesson, the learner should be able to:

Describe the ring mains circuit
Explain advantages of ring mains system
Wire a three-pin plug correctly
Identify wire color coding in electrical systems

Q&A on fuses and safety devices
Drawing ring mains circuit diagrams
Practical wiring of three-pin plugs
Color coding identification exercise
Safety demonstration with earthing

Three-pin plugs
Electrical cables
Wire strippers
Screwdrivers
Ring mains circuit model
Color-coded wires

KLB Secondary Physics Form 4, Pages 124-125

Mains Electricity

Electrical Energy Consumption and Costing
Problem Solving and Applications

By the end of the lesson, the learner should be able to:

Define kilowatt-hour (kWh)
Calculate electrical energy consumption
Determine cost of electrical energy
Apply energy formulas to practical problems

Review of power and energy concepts
Introduction to kilowatt-hour unit
Worked examples on energy calculations
Practice problems on electricity billing
Analysis of electricity bills

Calculators
Sample electricity bills
Electrical appliances with ratings
Stop watches
Energy meter model
Formula charts
Problem sheets
Past examination questions
Real electricity bills
Energy conservation charts

KLB Secondary Physics Form 4, Pages 125-128

Cathode Rays and Cathode Ray Tube

Thermionic Emission
Production and Properties of Cathode Rays

By the end of the lesson, the learner should be able to:

Define thermionic emission
Explain the process of electron emission from heated metals
Describe a simple experiment to demonstrate thermionic emission
State factors affecting thermionic emission

Q&A on electron structure and energy
Demonstration of thermionic emission using simple circuit
Discussion on work function of different metals
Explanation of electron emission process
Identification of materials used in cathodes

Simple thermionic emission apparatus
Low voltage power supply (6V)
Milliammeter
Evacuated glass bulb
Heated filament
Charts showing electron emission
Cathode ray tube (simple)
High voltage supply (EHT)
Fluorescent screen
Maltese cross or opaque object
Bar magnets
Charged plates

KLB Secondary Physics Form 4, Pages 131-132

Cathode Rays and Cathode Ray Tube

Structure of Cathode Ray Oscilloscope

By the end of the lesson, the learner should be able to:

Identify the main parts of a CRO
Describe the function of the electron gun
Explain the focusing system in CRO
Describe the deflection system (X and Y plates)

Q&A on cathode ray properties
Examination of CRO structure using diagrams
Identification of CRO components
Drawing and labeling CRO parts
Explanation of electron gun operation

CRO (demonstration model)
Charts showing CRO structure
Diagrams of electron gun
Models of deflection plates
High voltage power supply

KLB Secondary Physics Form 4, Pages 133-135

Cathode Rays and Cathode Ray Tube

CRO Controls and Operation
CRO as a Voltmeter

By the end of the lesson, the learner should be able to:

Explain the function of brightness and focus controls
Describe vertical and horizontal deflection systems
Explain the time base operation
Demonstrate basic CRO operation

Review of CRO structure
Demonstration of CRO controls
Explanation of time base voltage
Practice with focus and brightness adjustment
Observation of spot movement across screen

Working CRO
Signal generator
Connecting leads
Various input signals
Time base control charts
Oscilloscope manual
DC power supplies
AC signal sources
Digital voltmeter
Graph paper
Calculators

KLB Secondary Physics Form 4, Pages 135-137

Cathode Rays and Cathode Ray Tube

Frequency Measurement using CRO
The Television Tube

By the end of the lesson, the learner should be able to:

Measure frequency of AC signals using CRO
Calculate period and frequency from CRO traces
Apply the relationship f = 1/T
Determine peak voltage of AC signals

Review of voltage measurement with CRO
Demonstration of AC signal display on CRO
Measurement of wavelength and period
Calculation of frequency from time base setting
Practice problems on frequency determination

Working CRO with time base
Audio frequency generator
Connecting leads
Graph paper for measurements
Calculators
Stop watch
TV tube (demonstration model)
Deflection coils
TV receiver (old CRT type)
Charts comparing TV and CRO
Color TV tube diagram

KLB Secondary Physics Form 4, Pages 139-141

Cathode Rays and Cathode Ray Tube
X-Rays

Problem Solving and Applications
Production of X-Rays

By the end of the lesson, the learner should be able to:

Solve numerical problems on CRO measurements
Apply CRO principles to practical situations
Analyze waveforms displayed on CRO
Evaluate the importance of cathode ray technology

Review of all chapter concepts
Problem-solving exercises on voltage and frequency measurements
Analysis of complex waveforms
Discussion on modern applications of cathode ray technology
Assessment preparation

Calculators
Problem-solving worksheets
Sample CRO traces
Past examination questions
Graph paper
Reference materials
Charts showing X-ray tube structure
Diagram of X-ray production process
Models of rotating anode
Pictures of medical X-ray equipment
Video clips of X-ray tube operation

KLB Secondary Physics Form 4, Pages 131-142

X-Rays

Properties of X-Rays and Energy Concepts

By the end of the lesson, the learner should be able to:

State the properties of X-rays
Explain X-rays as electromagnetic radiation
Calculate the energy of X-rays using E = hf
Relate X-ray energy to accelerating voltage

Review of X-ray production
Demonstration of X-ray properties using simulations
Calculation of X-ray energy and frequency
Problem-solving on energy-voltage relationships
Comparison with other electromagnetic radiations

Calculators
Electromagnetic spectrum chart
Energy calculation worksheets
Constants and formulae charts
Sample X-ray images

KLB Secondary Physics Form 4, Pages 145-147

X-Rays

Hard and Soft X-Rays
Uses of X-Rays in Medicine and Industry

By the end of the lesson, the learner should be able to:

Distinguish between hard and soft X-rays
Explain factors affecting X-ray hardness
Relate accelerating voltage to X-ray penetrating power
Describe intensity and quantity control of X-rays

Q&A on X-ray properties and energy
Comparison of hard and soft X-rays characteristics
Discussion on penetrating power differences
Explanation of voltage effects on X-ray quality
Analysis of X-ray intensity control methods

Comparison charts of hard vs soft X-rays
Penetration demonstration materials
Voltage control diagrams
Medical X-ray examples
Industrial X-ray applications
Medical X-ray images
CT scan pictures
Industrial radiography examples
Crystal diffraction patterns
Airport security equipment photos
Charts of various X-ray applications

KLB Secondary Physics Form 4, Pages 147-148

X-Rays

Dangers of X-Rays and Safety Precautions
Problem Solving and Applications Review

By the end of the lesson, the learner should be able to:

Explain the dangers of X-ray exposure
Describe cumulative effects of radiation
State safety precautions for X-ray workers
Explain protective measures in X-ray facilities

Q&A on X-ray applications
Discussion on biological effects of X-rays
Explanation of radiation protection principles
Description of lead shielding and protective equipment
Analysis of safety protocols in medical facilities

Safety equipment samples (lead aprons)
Radiation warning signs
Pictures of X-ray protection facilities
Dosimeter badges
Charts showing radiation effects
Safety protocol posters
Calculators
Problem-solving worksheets
Past examination questions
Real X-ray case studies
Modern X-ray technology articles
Assessment materials

KLB Secondary Physics Form 4, Pages 149

Photoelectric Effect

Demonstration and Introduction to Photoelectric Effect

By the end of the lesson, the learner should be able to:

Define photoelectric effect
Describe experiments to demonstrate photoelectric effect
Explain observations from photoelectric experiments
Identify conditions necessary for photoelectric emission

Q&A on electromagnetic radiation and light
Demonstration using zinc plate and UV lamp
Experiment with charged electroscope and UV radiation
Observation and explanation of leaf divergence changes
Discussion on electron emission from metal surfaces

UV lamp (mercury vapor)
Zinc plate
Gold leaf electroscope
Glass barrier
Metal plates
Galvanometer
Connecting wires

KLB Secondary Physics Form 4, Pages 151-153

Photoelectric Effect

Light Energy and Quantum Theory
Einstein's Photoelectric Equation and Work Function

By the end of the lesson, the learner should be able to:

Explain Planck's quantum theory of light
Define photon and quantum of energy
Apply the equation E = hf to calculate photon energy
Compare energies of different wavelength radiations

Review of photoelectric effect observations
Introduction to Planck's constant and quantum theory
Calculation of photon energies for different wavelengths
Worked examples comparing red and violet light energies
Problem-solving exercises on photon energy

Calculators
Electromagnetic spectrum chart
Planck's constant reference
Worked example sheets
Wave equation materials
Color filters
Work function data table
Einstein's equation reference
Metal samples (theoretical)
Energy level diagrams
Problem-solving worksheets

KLB Secondary Physics Form 4, Pages 153

Photoelectric Effect

Factors Affecting Photoelectric Effect
Applications of Photoelectric Effect

By the end of the lesson, the learner should be able to:

Explain how intensity affects photoelectric emission
Describe the relationship between frequency and kinetic energy
Analyze the effect of different metal types
Interpret graphs of stopping potential vs frequency

Review of Einstein's equation applications
Experimental analysis of intensity effects
Investigation of frequency-energy relationships
Interpretation of stopping potential graphs
Calculation of Planck's constant from experimental data

Experimental setup diagrams
Graph paper
Stopping potential data
Frequency vs energy graphs
Different metal characteristics
Calculators
Photoemissive cell samples
Light-dependent resistor (LDR)
Solar panel demonstration
Application circuit diagrams
Conveyor belt counting model
Burglar alarm circuit

KLB Secondary Physics Form 4, Pages 156-160

Photoelectric Effect

Problem Solving and Applications Review

By the end of the lesson, the learner should be able to:

Solve complex problems involving photoelectric equations
Calculate threshold wavelength and frequency
Determine stopping potential and kinetic energy
Apply photoelectric principles to real-world scenarios

Review of all photoelectric effect concepts
Comprehensive problem-solving sessions
Analysis of examination-type questions
Discussion on modern photoelectric applications
Assessment and evaluation exercises

Calculators
Comprehensive problem sets
Past examination questions
Constants and formulae sheets
Graph paper
Assessment materials

KLB Secondary Physics Form 4, Pages 151-163