Waves and Optics

Radioactivity - Meaning of radioactivity and related terms
Radioactivity - Stability of isotopes and atomic structure

By the end of the lesson, the learner should be able to:
Explain the meaning of radioactivity and related terms
- Define nuclear stability, half-life, nuclide, and radioisotope
- Relate radioactivity to smoke detectors and medical treatments

In groups, learners are guided to:

- Use digital resources to search for meanings of radioactivity terms
- Discuss the meaning of radioactive decay, background radiation, and nucleotide

What is radioactivity and why do some atoms decay?

Digital resources
- Physics reference books
- Charts showing atomic structure

- Oral questions - Written assignments - Group discussions

Waves and Optics

Radioactivity - Types of radiations (alpha, beta, gamma)

-Identify the three types of radioactive radiations
- Describe the nature and charge of alpha, beta, and gamma radiations
- Relate radiation types to their uses in cancer treatment and sterilization

In groups, learners are guided to:

- Discuss the composition of alpha particles (helium nucleus)
- Explain beta particles as high-energy electrons
- Describe gamma rays as electromagnetic radiation

What are the different types of radioactive emissions?

-Digital resources
- Charts showing radiation types

- Oral questions - Written tests - Chart interpretation

Waves and Optics

Radioactivity - Properties of alpha and beta particles

-Describe properties of alpha and beta particles
- Compare penetrating power, ionizing ability, and speed of alpha and beta particles
- Connect alpha radiation properties to smoke detector operation

learners will Discuss penetrating power: alpha stopped by paper, beta by aluminium
- Compare ionizing power: alpha highest, beta moderate
- Explain deflection in electric and magnetic fields

Why are alpha particles more ionizing but less penetrating than beta particles?

- Digital resources
- Charts comparing radiation properties

- Written tests - Oral questions - Comparison tables

Waves and Optics

Radioactivity - Properties of gamma rays and comparison of radiations
Radioactivity - Alpha decay and nuclear equations

-Describe properties of gamma rays
- Compare all three types of radiations using charts and diagrams
- Relate gamma ray properties to their use in X-ray imaging and cancer treatment

 learners are guided to:
-Discuss gamma ray properties: no charge, no mass, highest penetration
- Make charts comparing penetrating power, ionizing effect, and field deflection
- Use diagrams to illustrate effect of magnetic and electric fields on radiations

Why are gamma rays not deflected by electric or magnetic fields?

- Digital resources
- Charts and diagrams
- Spotlight Physics Grade 10 pg. 186
- Periodic table

- Chart making - Written tests - Oral questions

Waves and Optics

Radioactivity - Beta decay and gamma decay equations

Write nuclear equations for beta and gamma decay
- Explain how beta decay changes a neutron to a proton
- Relate beta decay to carbon-14 dating of organic materials

 learners are guided to:

- Discuss beta decay: neutron changes to proton and electron
- Write nuclear equation for carbon-14 decaying to nitrogen-14
- Explain gamma decay as energy release without change in mass or atomic number

How do beta and gamma decay differ from alpha decay?

- Digital resources
- Periodic table

- Written tests - Problem-solving exercises - Oral questions

Waves and Optics

Radioactivity - Uranium-238 decay series

- Trace the uranium-238 natural decay series
- Write nuclear equations for chain decay reactions
- Connect decay series to geological dating of rocks

 learners are guided to:

- Study the uranium-238 decay chain from U-238 to stable Pb-206
- Identify types of radiations emitted at each stage
- Write nuclear equations for each step in the decay series

How does uranium-238 eventually become stable lead-206?

- Charts showing decay series
- Digital resources

- Chart interpretation - Written tests - Oral questions

Waves and Optics

Radioactivity - Detection using electroscope and GM tube
Radioactivity - Cloud chambers and nuclear emulsion plates

-Describe detection of radioactive emissions using electroscope
- Explain the structure and operation of a Geiger-Müller tube
- Relate GM tube operation to radiation monitoring in nuclear power plants

 learners are guided to:
-Demonstrate how a charged electroscope loses charge near a radioactive source
- Discuss the components and operation of a GM tube
- Explain how ionization produces pulses counted by a scaler

How does a Geiger-Müller tube detect radiation?

- Electroscope
- Diagrams of GM tube
- Diagrams of cloud chambers
- Digital resources

- Practical demonstration - Oral questions - Written tests

Waves and Optics

Radioactivity - Meaning and demonstration of half-life

-Explain the meaning of half-life
- Demonstrate half-life concept using water draining from a burette
- Relate half-life to how long radioactive waste remains dangerous

 learners are guided to:

- Define half-life as time for half the radioactive atoms to decay
- Perform water drainage experiment to simulate radioactive decay
- Plot a graph of volume against time and determine half-life

How long does it take for half of a radioactive sample to decay?

- Burette
- Retort stand
- Stop clock

- Practical assessment - Graph plotting - Oral questions

Waves and Optics

Radioactivity - Calculating half-life using graphs and formula

-Calculate half-life from decay curves
- Apply the half-life formula N = N₀(½)^(T/t)
- Connect half-life calculations to determining age of archaeological samples

In groups, learners are guided to:

- Plot decay curves from given data and determine half-life
- Derive and apply the formula N = N₀(½)^(T/t)
- Solve numerical problems involving half-life calculations

How do we calculate the half-life of a radioactive substance?

- Graph paper
- Scientific calculators

- Written tests - Problem-solving exercises - Graph interpretation

Waves and Optics

Radioactivity - Significance and applications of half-life
Radioactivity - Nuclear fission and chain reactions

-Explain the significance of half-life in various fields
- Describe applications in medicine, environment, and nuclear power
- Relate half-life to planning cancer treatment doses and nuclear waste storage

In groups, learners are guided to:

- Discuss significance in nuclear medicine and carbon dating
- Explain importance in nuclear waste management
- Research applications in pharmacokinetics and safety regulations

Why is understanding half-life important in medicine and nuclear power?

- Digital resources
- Physics reference books
- Diagrams of chain reactions
- Digital resources

- Research presentations - Written tests - Oral questions

Waves and Optics

Radioactivity - Nuclear fusion and applications

-Explain the meaning of nuclear fusion
- Compare nuclear fusion with fission
- Relate fusion to how the sun and stars produce energy

Learners in pairs will discuss how light nuclei combine to form heavier nuclei
- Explain why fusion requires extremely high temperatures
- Compare energy released in fusion versus fission reactions

Why does nuclear fusion power the sun and stars?

- Diagrams showing fusion
- Digital resources

- Written tests - Comparison tables - Oral questions

Waves and Optics

Radioactivity - Applications in medicine and industry
Radioactivity - Applications in agriculture and archaeology

-Describe applications of radioactivity in medicine and industry
- Explain how gamma rays treat cancer and sterilize equipment
- Relate industrial applications to detecting pipe leaks and measuring thickness

 Learners are guided to:
-Discuss medical applications: cancer treatment, sterilization, imaging
- Explain industrial uses: detecting pipe bursts, thickness measurement, flaw detection
- Research use of radioactive tracers in various fields

How is radioactivity used to treat cancer and detect pipe leaks?

- Diagrams showing applications
- Digital resources
- Digital resources
- Charts on carbon dating

- Research presentations - Written tests - Oral questions

Waves and Optics

Radioactivity - Hazards of radiation and safety precautions

-Describe hazards caused by radioactive materials
- Explain safety precautions when handling radioactive substances
- Relate safety measures to protection of workers in hospitals and nuclear facilities

Learners are guided to:
-Discuss effects of radiation exposure: burns, cancer, hereditary defects
- Explain precautions: avoiding direct contact, using forceps, lead storage
- Role-play safety scenarios in radiation handling

What safety measures protect workers from radiation exposure?

- Safety signs
- Digital resources

- Role-play assessment - Written tests - Oral questions

Electricity and Magnetism

Origin of charges in a material
The law of electrostatics
Methods of charging conductors - Induction and Contact

-Define electric charge and state its SI unit
- Describe the atomic structure and origin of charges in materials
- Relate static electricity to everyday experiences like clothes clinging after tumble drying

Learners are guided to:
- Discuss with peers the origin of charges on materials (atom, nucleus, neutrons, protons and electrons)
- Use digital resources to search for information on atomic structure
- Perform experiments to demonstrate generation of static charges through rubbing plastic pen on woolen cloth

How do materials acquire electric charges?

- Plastic pen, woolen cloth
- Small pieces of paper
- Digital resources
- Balloons, woolen cloth
- Thread, retort stands
- Metre rule
- Metallic spheres on insulated stands
- Charged polythene and glass rods
- Connecting wire for earthing

- Oral questions - Observation - Written assignments

Electricity and Magnetism

Methods of charging conductors - Separation and charge distribution
Electric field patterns
The electroscope - Structure, charging and discharging

-Describe charging by separation method
- Illustrate charge distribution on conductors of various shapes
- Connect charge concentration at sharp points to lightning rod design

Learners are guided to:
- Carry out activities to charge two spheres by separation method
- Discuss how charge distributes on spherical, pear-shaped and irregular conductors
- Draw diagrams showing charge distribution on different shaped conductors

Why does charge concentrate at pointed ends of conductors?

- Charts showing electric field patterns
- Digital resources
- Drawing materials
- Gold-leaf electroscope
- Charged polythene and glass rods
- Conical flask, aluminium foil, metal spoon

- Observation - Written assignments - Diagram assessment

Electricity and Magnetism

Uses of electroscope
Applications - Spray painting, precipitators and photocopiers

-Describe uses of an electroscope
- Demonstrate testing for presence, type and quantity of charge
- Apply electroscope principles to quality control testing in manufacturing

Learners are guided to:
- Perform experiments to test for presence of charge on a body
- Determine the type of charge using a charged electroscope
- Measure relative quantity of charge
- Test conducting and insulating properties of materials

How can an electroscope determine the type of charge on a body?

- Gold-leaf electroscope
- Various charged materials
- Conductors and insulators for testing
- Charts and diagrams
- Digital resources
- Videos on spray painting

- Practical assessment - Oral questions - Written tests

Electricity and Magnetism

Applications - Lightning arrestors and safety measures
Applications - Touch screens, fingerprinting and capacitors

-Explain the design and function of lightning arrestors
- Describe safety measures in transportation of flammable substances
- Relate lightning arrestors to protection of buildings during thunderstorms

Learners are guided to:
- Discuss the design and function of lightning arrestors
- Explain why metallic chains are attached to fuel tankers
- Research safety in transportation of flammable liquids and gases
- Discuss why people should not stand under trees during storms

Why are lightning arrestors installed on tall buildings?

- Pictures of lightning arrestors
- Charts on safety measures
- Digital resources
- Smartphones and tablets
- Digital resources
- Charts on touch screen technology

- Oral questions - Written assignments - Group discussions

Electricity and Magnetism

Current and potential difference
Electromotive force and internal resistance
Ohm's law - Verification and calculations

-Define electric current and potential difference with their SI units
- Measure current using ammeter and potential difference using voltmeter
- Relate current flow to water flow in pipes for practical understanding

Learners are guided to:
- Set up simple circuits with cells, bulb, ammeter and voltmeter
- Discuss current as rate of flow of charge (I = Q/t)
- Discuss potential difference as work done per unit charge (V = W/Q)
- Measure and record current and voltage in circuits

What is the relationship between charge, current and potential difference?

- Dry cells, cell holders
- Ammeter, voltmeter, bulb
- Connecting wires, switch
- Dry cells, two voltmeters
- Known resistors, switch
- Connecting wires
- Nichrome wire, ammeter
- Voltmeter, rheostat
- Dry cells, graph paper

- Practical assessment - Oral questions - Written calculations

Electricity and Magnetism

EMF equation and internal resistance determination
Ohmic and non-ohmic conductors
Factors affecting resistance - Length and cross-sectional area

-Derive and apply the relationship E = I(R+r)
- Determine internal resistance graphically using V-I graph
- Apply EMF calculations to assess battery quality and performance

Learners are guided to:
- Derive E = IR + Ir mathematically
- Vary current in a circuit and record terminal voltages
- Plot graph of V against I to determine r from gradient and E from y-intercept
- Solve problems involving EMF and internal resistance

How can we determine internal resistance of a cell graphically?

- Dry cells, ammeter
- Voltmeter, rheostat
- Graph paper
- Ammeter, voltmeter, rheostat
- Nichrome wire, metre rule
- Wires of different thickness
- Micrometer screw gauge, ammeter, voltmeter

- Graph plotting - Written calculations - Oral questions

Electricity and Magnetism

Factors affecting resistance - Temperature and resistivity
Methods of determining resistance

Investigate the effect of temperature on resistance of conductors
- Define resistivity and apply ρ = RA/L
- Relate temperature effects to why light bulbs glow brighter when hot

In groups, learners are guided to:
- Heat a coil of wire and measure resistance at different temperatures
- Plot R-T graphs for conductors and semiconductors
- Derive resistivity formula from R = ρL/A
- Calculate and compare resistivity of different materials

How does temperature affect the resistance of a conductor?

- Tungsten coil, beaker
- Thermometer, heat source
- Ammeter, voltmeter
- Metre bridge, Wheatstone bridge components
- Galvanometer, jockey
- Resistors with colour codes

- Practical assessment - Graph plotting - Written calculations

Electricity and Magnetism

Types of resistors and current-voltage laws
Effective resistance in series and parallel

- Identify and classify types of resistors (fixed, variable, linear, non-linear)
- Verify laws of current and voltage in series and parallel circuits
- Connect resistor types to volume controls and temperature sensors

Learners are guided to:
- Study different types of resistors and their applications
- Connect bulbs in series and verify I₁ = I₂ = I₃ and V = V₁ + V₂ + V₃
- Connect bulbs in parallel and verify I = I₁ + I₂ + I₃ and V₁ = V₂ = V₃
- Discuss applications of rheostats and potentiometers

Why is current the same in series but voltage the same in parallel?

- Various types of resistors
- Identical bulbs, ammeters
- Voltmeters, dry cells
- Resistors of known values
- Scientific calculators
- Circuit diagrams, worksheets

- Practical assessment - Oral questions - Written assignments

Electricity and Magnetism

Solving complex resistor network problems

-Analyse circuits with multiple series-parallel combinations
- Calculate current through and voltage across each resistor
- Apply circuit analysis to troubleshoot electrical faults in appliances

Learners are guided to:
- Identify series and parallel sections in complex circuits
- Calculate effective resistance step by step
- Determine current distribution in branches
- Calculate potential difference across each component

How do we analyse circuits with both series and parallel resistors?

- Complex circuit diagrams
- Scientific calculators
- Worksheets with problems

- Written calculations - Circuit analysis - Oral questions

Electricity and Magnetism

Relationship of V, I and P - Power equations
Factors affecting heating effect of electric current

-Derive and apply power equations P = VI, P = I²R and P = V²/R
- Calculate power consumption of electrical devices
- Relate power ratings to energy efficiency of household appliances

Learners are guided to:
- Discuss electrical power as rate of energy conversion
- Derive power equations from P = W/t and Ohm's law
- Calculate power in circuits using different formulas
- Compare power ratings of various appliances

What is the relationship between voltage, current and power?

- Scientific calculators
- Power rating labels from appliances
- Worksheet
- Heating coils, beaker
- Thermometer, stopwatch
- Ammeter, voltmeter, rheostat

- Written calculations - Oral questions - Problem-solving tests

Electricity and Magnetism

Applications of heating effect of electric current

Describe applications of heating effect in electrical appliances
- Explain the working of electric heaters, kettles, iron boxes and fuses
- Relate heating applications to safe and efficient use of electrical devices at home

Learners are guided to:
- Research on electrical appliances that use heating effect
- Classify appliances as heating devices, kitchenware or lighting devices
- Discuss the working of electric iron, kettle, heater and filament lamp
- Explain the function and selection of appropriate fuses

How is the heating effect of electric current applied in household appliances?

- Pictures of electrical appliances
- Fuses of different ratings
- Digital resources

- Oral questions - Written assignments - Research presentations

Electricity and Magnetism

Power rating and electrical energy calculations
Conductors, semiconductors, insulators and superconductors

-Interpret power ratings on electrical appliances
- Calculate electrical energy consumption using E = Pt
- Apply energy calculations to reduce electricity bills at home

Learners are guided to:
- Read and interpret power ratings on appliance labels
- Calculate energy consumed in joules and kilowatt-hours
- Calculate cost of running appliances using electricity tariffs
- Discuss energy-saving practices

How do we calculate the cost of running electrical appliances?

- Power rating labels
- Scientific calculators
- Electricity tariff information
- Models of atomic structures
- Charts showing material classification
- Digital resources

- Written calculations - Oral questions - Problem-solving tests

Electricity and Magnetism

Distinguishing materials using energy band theory
Effect of temperature on conductors and semiconductors
Intrinsic semiconductors and doping

Explain energy band theory (valence band, conduction band, forbidden gap)
- Distinguish between conductors, semiconductors and insulators using band diagrams
- Connect energy bands to how LEDs produce light of specific colours

In groups, learners are guided to:
- Discuss the concept of valence band, conduction band and forbidden energy gap
- Draw energy band diagrams for conductors, semiconductors and insulators
- Compare the size of energy gaps in different materials
- Explain electron movement in terms of energy bands

How does energy band theory explain electrical conductivity?

- Charts showing energy bands
- Digital resources
- Drawing materials
- Charts showing doping process
- Models of crystal structures

- Diagram drawing - Oral questions - Written explanations

Electricity and Magnetism

N-type and p-type semiconductors
Applications of conductors and insulators

-Explain the formation of n-type and p-type semiconductors
- Identify majority and minority charge carriers in each type
- Relate n-type and p-type semiconductors to diode and transistor construction

In groups, learners are guided to:
- Discuss doping silicon with pentavalent atoms (P, As, Sb) to form n-type
- Draw diagrams showing electrons as majority carriers in n-type
- Discuss doping with trivalent atoms (B, Al, Ga) to form p-type
- Draw diagrams showing holes as majority carriers in p-type

How are n-type and p-type semiconductors formed?

- Diagrams of crystal lattice
- Charts showing n-type and p-type formation
- Digital resources
- Samples of electrical cables
- Pictures of electrical installations

- Diagram drawing - Oral questions - Written comparisons

Electricity and Magnetism
Environmental and Space Physics

Applications of semiconductors and superconductors
Application of conductors and insulators in car wiring system
Greenhouse Effect and Climate Change - Greenhouse effect and climate change in the environment

Describe applications of semiconductors in electronics and sensors
- Describe applications of superconductors in modern technology
- Connect semiconductor applications to smartphones, computers, solar panels and medical equipment

Learners are guided to:
- Research on semiconductor applications (transistors, diodes, LEDs, thermistors, solar cells)
- Discuss use of thermistors in temperature sensors and fire alarms
- Explain applications of superconductors (MRI machines, maglev trains, power transmission)
- Discuss future potential of superconductors

How are semiconductors used in modern electronic devices?

- Electronic components
- Pictures of semiconductor devices
- Digital resources
- Car wiring diagrams
- Samples of automotive cables
- Digital resources
- Resource persons (mechanics)
- Clear plastic bottles/jars
- Thermometers
- Plastic wrap
- Digital devices

- Oral questions - Written assignments - Research presentations

Environmental and Space Physics

Greenhouse Effect and Climate Change - Physical drivers of climate change
Greenhouse Effect and Climate Change - Factors leading to greenhouse effect
Greenhouse Effect and Climate Change - Agricultural and livestock contributions

-Explain how greenhouse gases trap heat in the atmosphere
- Illustrate the process of heat absorption and re-emission by greenhouse gases
- Relate the greenhouse effect to temperature changes experienced in greenhouses and parked vehicles

In groups, learners are guided to:

- Study diagrams showing physical drivers of climate change
- Discuss with peers how greenhouse gases absorb and re-emit infrared radiation
- Use print or non-print media to search for more information on climate change drivers

Why is the Earth warmer than it would be without greenhouse gases?

- Charts showing greenhouse effect
- Digital resources
- Pictures of industrial activities
- Charts showing greenhouse gas sources
- Digital devices

- Oral questions - Group presentations - Written tests

Environmental and Space Physics

Greenhouse Effect and Climate Change - Role of ozone layer
Greenhouse Effect and Climate Change - Ozone depletion and climate change
Greenhouse Effect and Climate Change - Strategies for mitigating climate change

-Explain the structure and location of the ozone layer
- Describe the role of ozone layer in protecting Earth from UV radiation
- Connect ozone layer protection to reduced cases of sunburns and skin conditions

In groups, learners are guided to:

- Use digital resources to search for information on ozone layer
- Study diagrams showing the ozone layer and its role
- Discuss the importance of ozone layer in protecting life on Earth

What would happen to life on Earth without the ozone layer?

- Diagrams of ozone layer
- Digital resources
- Charts on ozone depletion
- Digital devices
- Pictures of renewable energy sources

- Oral questions - Written assignments - Group presentations

Environmental and Space Physics

Greenhouse Effect and Climate Change - Effects of climate change on environment
Introduction to Space Physics - Big Bang Theory

-Describe the impacts of climate change on weather patterns, water bodies and vegetation
- Analyse changes in local environment due to climate change
- Connect observed changes in local rivers and lakes to climate change effects

In groups, learners are guided to:

- Discuss the effects of climate change on global temperatures, weather patterns, water levels and vegetation
- Demonstrate effects of climate change in the immediate environment
- Initiate a school project to help reduce greenhouse gas emissions

How has climate change affected your local environment?

- Pictures showing climate change effects
- Digital devices
- Charts on Big Bang Theory
- Digital resources

- Observation - Oral questions - Project presentations

Environmental and Space Physics

Introduction to Space Physics - Stars, planets and satellites
Introduction to Space Physics - Asteroids, comets, meteors and galaxies
Introduction to Space Physics - Space exploration methods and telescopy

-Define celestial bodies and give examples
- Classify celestial bodies as stars, planets and satellites
- Relate the sun as a star to the light and heat we receive daily

In groups, learners are guided to:

- Study photos of celestial bodies in space
- Discuss the characteristics of stars, planets and satellites
- Use digital resources to search for types of celestial bodies

What celestial bodies can you observe in the night sky?

- Photos of celestial bodies
- Digital devices
- Pictures of comets and galaxies
- Digital resources
- Lenses, manila paper, glue
- Pictures of telescopes

- Observation - Oral questions - Written tests

Environmental and Space Physics

Introduction to Space Physics - Motion of planets around the sun
Introduction to Space Physics - Careers in space exploration

-Explain Kepler's laws of planetary motion
- Describe how planets orbit the sun in elliptical paths
- Connect seasonal changes on Earth to its orbital motion around the sun

In groups, learners are guided to:

- Study models of planetary motion with respect to the sun
- Discuss how planets move around their orbits
- Use digital resources to search for information on Kepler's laws

Why do planets follow elliptical orbits around the sun?

- Models of solar system
- Charts on Kepler's laws
- Digital resources
- Career charts
- Digital devices

- Oral questions - Group presentations - Written tests