Waves and Optics

Properties of Waves - Wave properties in real-life situations
Properties of Waves - Demonstrating wave properties using a ripple tank
Properties of Waves - Rectilinear propagation of waves

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

- Define wave properties including rectilinear propagation, reflection, refraction, diffraction and interference
- Identify examples of wave properties in everyday life
- Relate wave properties to real-life applications such as mirrors, lenses and sound systems

- Identify the parts of a ripple tank and state their functions
- Set up a ripple tank for wave demonstration
- Connect wave patterns observed in a ripple tank to natural phenomena like water waves at the beach

In groups, learners are guided to:

- Brainstorm on what was learnt in Grade 9 about waves
- Use digital devices or reference books to search for the meaning of wave properties
- Copy and complete a table showing wave properties and their applications
- Present findings on properties of waves in a class discussion

- Observe a ripple tank and its components
- Label key parts of the ripple tank
- Copy and complete a table showing parts and functions of a ripple tank
- Fill the tank with water and test wave generation

How do wave properties affect our daily experiences with light and sound?
What role does each part of a ripple tank play in demonstrating wave behaviour?

- Triumph Physics 10 pg. 139
- Digital devices
- Reference books
- Writing materials
- Triumph Physics 10 pg. 141
- Ripple tank with components
- Bar and ball dippers
- Light source
- White screen
- Triumph Physics 10 pg. 143
- Ripple tank
- Manila paper
- Markers

- Oral questions - Observation - Written assignments
- Observation - Oral questions - Practical assessment

Waves and Optics

Properties of Waves - Reflection of waves

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

- State the law of reflection
- Demonstrate reflection of waves using different shaped barriers
- Relate wave reflection to everyday applications like mirrors, periscopes and acoustic design

In groups, learners are guided to:

- Generate plane waves and observe reflection off straight barriers
- Measure and compare angles of incidence and reflection
- Observe reflection patterns using concave and convex barriers
- Sketch wave patterns before and after reflection

How does the shape of a barrier affect the reflection pattern of waves?

- Triumph Physics 10 pg. 144
- Ripple tank
- Metal barriers (straight, concave, convex)
- Ruler
- Manila paper

- Practical assessment - Observation - Oral questions

Waves and Optics

Properties of Waves - Refraction of waves

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

- Explain refraction as bending of waves due to change in speed
- Demonstrate refraction of waves in a ripple tank
- Connect refraction to how lenses work in eyeglasses, cameras and microscopes

In groups, learners are guided to:

- Place rectangular plastic sheets to create shallow water regions
- Observe how wave speed and direction change at boundaries
- Sketch wave patterns showing refraction
- Discuss why sound travels farther at night than during the day

Why do waves bend when they move from one medium to another?

- Triumph Physics 10 pg. 147
- Ripple tank
- Clear plastic sheets (rectangular and convex)
- Manila paper
- Markers

- Practical assessment - Written assignments - Observation

Waves and Optics

Properties of Waves - Diffraction of waves
Properties of Waves - Interference of waves

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

- Define diffraction as bending of waves around obstacles or through gaps
- Demonstrate diffraction using a ripple tank
- Relate diffraction to hearing sound around corners and Wi-Fi signal distribution

In groups, learners are guided to:

- Position metal barriers with gaps in the ripple tank
- Observe wave spreading after passing through gaps of different sizes
- Observe diffraction around obstacles and at edges
- Sketch diffraction patterns and discuss applications

How does the size of an opening affect the amount of wave diffraction?

- Triumph Physics 10 pg. 150
- Ripple tank
- Metal barriers with gaps
- Manila paper
- Markers
- Triumph Physics 10 pg. 152
- Two spherical dippers

- Practical assessment - Observation - Oral questions

Waves and Optics

Properties of Waves - Formation and properties of stationary waves

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

- Describe how stationary waves are formed from two progressive waves
- Identify nodes and antinodes in stationary waves
- Connect stationary waves to musical instruments like guitars and violins

In groups, learners are guided to:

- Stretch a rubber band and pluck to observe stationary wave patterns
- Identify regions of highest amplitude (antinodes) and zero amplitude (nodes)
- Vary tension and observe changes in wave pattern
- Discuss properties of stationary waves

How do nodes and antinodes form in a stationary wave?

- Triumph Physics 10 pg. 155
- Rubber bands
- Slinky spring
- Fixed block
- Smooth surface

- Practical assessment - Observation - Oral questions

Waves and Optics

Properties of Waves - Applications of stationary waves in vibrating strings

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

- Derive expressions for fundamental frequency and overtones in vibrating strings
- Calculate frequencies of harmonics in vibrating strings
- Connect vibrating strings to stringed musical instruments like guitars and pianos

In groups, learners are guided to:

- Set up a string attached to a fixed support and pulley with masses
- Pluck the string and observe stationary wave patterns
- Measure distance between nodes and antinodes
- Calculate fundamental frequency and overtones

How does changing string tension affect the pitch of sound produced?

- Triumph Physics 10 pg. 159
- String (1-2 metres)
- Fixed support
- Pulley and masses
- Ruler

- Written assignments - Practical assessment - Oral questions

Waves and Optics

Properties of Waves - Vibrating air columns in closed and open pipes

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

- Derive expressions for frequencies in closed and open pipes
- Differentiate between harmonics produced in closed and open pipes
- Connect vibrating air columns to wind instruments like flutes and clarinets

In groups, learners are guided to:

- Blow air across closed and open pipes and listen to sounds produced
- Compare pitch differences between closed and open pipes
- Discuss why closed pipes produce only odd harmonics
- Calculate frequencies of harmonics in pipes

Why do closed pipes produce only odd harmonics while open pipes produce all harmonics?

- Triumph Physics 10 pg. 161
- Closed pipe (boiling tube)
- Open pipe
- Ruler

- Written assignments - Oral questions - Practical assessment

Waves and Optics

Properties of Waves - Resonance and frequency modulated waves

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

- Explain resonance and its conditions
- Describe how FM radio waves carry sound information
- Connect resonance to tuning musical instruments and FM to radio broadcasting

In groups, learners are guided to:

- Set up a glass tube in water with a tuning fork to demonstrate resonance
- Adjust air column length to find resonance point
- Tune an FM radio receiver to different stations
- Research how FM radio waves carry sound information

How does a radio receiver select and play a specific FM station?

- Triumph Physics 10 pg. 164
- Glass tube
- Tuning fork
- Container with water
- FM radio receiver

- Oral questions - Written assignments - Observation

Waves and Optics

Properties of Waves - Doppler effect and applications

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

- Explain the Doppler effect and its causes
- Describe how frequency changes when source approaches or recedes
- Connect Doppler effect to ambulance sirens, radar speed detection and medical ultrasound

In groups, learners are guided to:

- Watch videos demonstrating Doppler effect with sound waves
- Observe how sound changes as source moves toward or away
- Discuss real-life applications of Doppler effect
- Record observations on frequency and pitch changes

Why does an ambulance siren sound different as it approaches compared to when it moves away?

- Triumph Physics 10 pg. 166
- Digital devices
- Internet access
- Writing materials

- Oral questions - Written assignments - Observation

Waves and Optics

Properties of Waves - Doppler effect and applications

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

- Explain the Doppler effect and its causes
- Describe how frequency changes when source approaches or recedes
- Connect Doppler effect to ambulance sirens, radar speed detection and medical ultrasound

In groups, learners are guided to:

- Watch videos demonstrating Doppler effect with sound waves
- Observe how sound changes as source moves toward or away
- Discuss real-life applications of Doppler effect
- Record observations on frequency and pitch changes

Why does an ambulance siren sound different as it approaches compared to when it moves away?

- Triumph Physics 10 pg. 166
- Digital devices
- Internet access
- Writing materials

- Oral questions - Written assignments - Observation

Waves and Optics

Radioactivity and Stability of Isotopes - Terminologies used in radioactivity
Radioactivity and Stability of Isotopes - Types and properties of alpha, beta and gamma radiations
Radioactivity and Stability of Isotopes - Behaviour of radiations in electric and magnetic fields

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

- Define terms used in radioactivity including atom, nuclide, half-life and radioisotope
- Explain factors that determine nuclear stability
- Connect radioactivity concepts to medical imaging and carbon dating

- Describe how alpha, beta and gamma radiations behave in electric and magnetic fields
- Draw diagrams showing deflection of radiations in fields
- Connect radiation deflection to particle accelerators and mass spectrometers

In groups, learners are guided to:

- Use digital devices or reference books to find meanings of radioactivity terms
- Discuss atomic number, mass number and isotopes
- Explain nuclear stability and background radiation
- Share findings on terminology in class discussion

- Draw bar charts comparing penetrating power and ionising effects
- Draw diagrams showing deflection in electric and magnetic fields
- Discuss why gamma rays are not deflected
- Present charts to class for peer learning

What makes some atomic nuclei stable while others are unstable?
Why are alpha and beta particles deflected in opposite directions in electric and magnetic fields?

- Triumph Physics 10 pg. 169
- Digital devices
- Reference books
- Periodic table
- Triumph Physics 10 pg. 171
- Property cards
- Manila paper
- Markers

- Triumph Physics 10 pg. 173
- Manila paper
- Coloured pencils
- Rulers

- Oral questions - Written assignments - Observation
- Practical assessment - Written assignments - Observation

Waves and Optics

Radioactivity and Stability of Isotopes - Nuclear equations showing how radionuclides attain stability

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

- Write balanced nuclear equations for alpha, beta and gamma decay
- Balance mass numbers and atomic numbers in nuclear equations
- Connect nuclear decay to energy production in nuclear power plants

In groups, learners are guided to:

- Learn the three main types of radioactive decay
- Write nuclear equations for alpha decay (e.g., Uranium-238 to Thorium-234)
- Write nuclear equations for beta decay
- Practise balancing nuclear equations

How do unstable nuclei transform to achieve stability through radioactive decay?

- Triumph Physics 10 pg. 175
- Periodic table
- Chart of nuclides
- Exercise books

- Written assignments - Oral questions - Observation

Waves and Optics

Radioactivity and Stability of Isotopes - Decay series and chain reactions
Radioactivity and Stability of Isotopes - Safety precautions in handling and disposing of radioactive substances

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

- Explain decay series as a sequence of radioactive decays
- Trace the uranium-238 decay series to lead-206
- Connect decay series to geological dating of rocks and minerals

In groups, learners are guided to:

- Observe and copy the Uranium-238 decay chart
- Identify radioactive emissions at each stage
- Write nuclear equations for decay steps in the series
- Present findings on decay series to class

Why does uranium-238 undergo multiple decays before becoming stable lead-206?

- Triumph Physics 10 pg. 178
- Uranium-238 decay chart
- Periodic table
- Exercise books
- Triumph Physics 10 pg. 179
- Digital devices
- Manila paper
- Markers

- Written assignments - Oral questions - Observation

Waves and Optics

Radioactivity and Stability of Isotopes - Detection of radioactive emissions using photographic plates and electroscopes

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

- Explain how photographic emulsions detect radiation
- Describe how a leaf electroscope detects radiation
- Connect radiation detection to radiation badges worn by hospital workers

In groups, learners are guided to:

- Observe demonstration of photographic plate detection
- Construct a simple electroscope and observe discharge near radioactive material
- Discuss how ionisation affects charge on foil strips
- Compare detection methods and their applications

How do photographic plates and electroscopes indicate the presence of radiation?

- Triumph Physics 10 pg. 180
- Photographic plates
- Electroscope materials
- Radioactive source

- Practical assessment - Oral questions - Observation

Waves and Optics

Radioactivity and Stability of Isotopes - Detection using Geiger-Muller counter and cloud chamber
Radioactivity and Stability of Isotopes - Half-life and decay curves

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

- Describe the working principle of a Geiger-Muller counter
- Explain how cloud chambers make radiation tracks visible
- Connect radiation detectors to nuclear safety monitoring and scientific research

- Define half-life and use the decay formula to calculate remaining nuclides
- Plot and interpret decay curves
- Connect half-life to carbon dating of archaeological artefacts

In groups, learners are guided to:

- Research how Geiger-Muller counter and cloud chamber work
- Identify characteristics of tracks from alpha, beta and gamma radiations
- Discuss advantages and limitations of each detection method
- Present findings on detection methods

- Demonstrate half-life using water draining from a burette
- Record time taken for different volumes to drain
- Plot decay curve and determine half-life from graph
- Calculate remaining mass after multiple half-lives

How does a Geiger-Muller counter convert radiation into measurable signals?
How can half-life be used to determine the age of ancient objects?

- Triumph Physics 10 pg. 183
- Digital devices
- Reference books
- Manila paper

- Triumph Physics 10 pg. 185
- Burette
- Stopwatch
- Beaker
- Graph paper

- Written assignments - Oral questions - Observation
- Practical assessment - Written assignments - Oral questions

Waves and Optics

Radioactivity and Stability of Isotopes - Nuclear fission, fusion and applications of radioactivity

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

- Differentiate between nuclear fission and nuclear fusion
- Write nuclear equations for fission and fusion reactions
- Connect nuclear reactions to power generation, medical imaging and cancer treatment

In groups, learners are guided to:

- Study pictures of nuclear fission reactions
- Discuss chain reactions and their control in nuclear reactors
- Research applications of radioactivity in medicine, industry and agriculture
- Present findings on applications to class

How do nuclear power plants harness fission energy while preventing uncontrolled chain reactions?

- Triumph Physics 10 pg. 189
- Digital devices
- Pictures of nuclear reactions
- Reference books

- Written assignments - Oral questions - Observation

Electricity and Magnetism

Electrostatics - Origin of charges in a material

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

- Explain the structure of an atom and origin of electric charges
- Describe how materials become positively or negatively charged
- Connect static electricity to everyday experiences like getting shocked after walking on carpet

In groups, learners are guided to:

- Discuss the origin of charges on materials (atom, nucleus, protons, neutrons, electrons)
- Perform experiments rubbing balloons on woollen cloth
- Observe attraction and repulsion of charged objects
- Discuss SI unit of charge and law of electrostatics

How do objects become electrically charged through the transfer of electrons?

- Triumph Physics 10 pg. 194
- Balloons
- Woollen cloth
- Small pieces of paper

- Oral questions - Observation - Practical assessment

Electricity and Magnetism

Electrostatics - Electric field patterns around charges

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

- Define an electric field and describe its properties
- Draw electric field patterns for isolated and interacting charges
- Connect electric fields to how lightning rods protect buildings

In groups, learners are guided to:

- Discuss the meaning of electric field and its properties
- Draw field patterns for isolated positive and negative charges
- Draw field patterns between like and unlike charges
- Draw field patterns between charged plates

Why do electric field lines never cross each other?

- Triumph Physics 10 pg. 196
- Manila paper
- Coloured pencils
- Rulers

- Written assignments - Oral questions - Observation

Electricity and Magnetism

Electrostatics - Law of electrostatics
Electrostatics - Charging by friction and contact methods
Electrostatics - Charging by induction and separation methods

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

- State the law of electrostatics
- Demonstrate attraction and repulsion between charged objects
- Connect electrostatic forces to how dust clings to TV screens and plastic surfaces

- Explain charging by friction and contact methods
- Demonstrate charging of objects using friction and contact
- Connect charging by friction to static shocks from car doors and door handles

In groups, learners are guided to:

- Suspend a charged plastic ruler and bring another charged ruler close
- Observe attraction and repulsion between similarly and oppositely charged objects
- Rub glass rod with silk and observe interaction with charged ruler
- Discuss the law of electrostatic charges

- Rub plastic pen with dry cloth and bring near paper pieces
- Sketch distribution of charges on rubbed materials
- Touch charged glass rod to polystyrene ball and observe charge transfer
- Discuss electron transfer in charging by contact

What determines whether two charged objects will attract or repel each other?
How does rubbing two materials together cause them to become charged?

- Triumph Physics 10 pg. 199
- Plastic rulers
- Glass rod
- Silk cloth
- Woollen cloth
- Triumph Physics 10 pg. 200
- Plastic pen
- Dry woollen cloth
- Polystyrene ball
- Glass rod
- Triumph Physics 10 pg. 203
- Polythene rod
- Metal balls on insulated stands
- Connecting wire

- Practical assessment - Oral questions - Observation
- Practical assessment - Written assignments - Observation

Electricity and Magnetism

Electrostatics - Charge distribution on conductors of various shapes

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

- Explain how charges distribute on conductors of different shapes
- Draw charge distribution on spherical, wedge-shaped and pear-shaped conductors
- Connect charge concentration at points to lightning conductors and Van de Graaff generators

In groups, learners are guided to:

- Research charge distribution on different shaped conductors
- Draw diagrams showing charge distribution on spherical, wedge-shaped, pear-shaped and sharp conductors
- Discuss why charges concentrate at pointed ends
- Present findings on charge distribution to class

Why do charges concentrate at the pointed ends of conductors?

- Triumph Physics 10 pg. 205
- Digital devices
- Reference books
- Manila paper

- Written assignments - Oral questions - Observation

Electricity and Magnetism

Electrostatics - Functions of various parts of an electroscope

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

- Identify and state functions of parts of a gold leaf electroscope
- Construct a simple electroscope using locally available materials
- Connect electroscope operation to radiation monitoring badges used by hospital workers

In groups, learners are guided to:

- Observe an electroscope and identify its main parts
- Research functions of metallic cap, metal rod, gold leaf and glass casing
- Construct a simple electroscope using paper clip, aluminium foil and plastic container
- Test the constructed electroscope with charged objects

How does each part of an electroscope contribute to detecting electric charges?

- Triumph Physics 10 pg. 207
- Gold leaf electroscope
- Paper clips
- Aluminium foil
- Plastic container

- Practical assessment - Oral questions - Observation

Electricity and Magnetism

Electrostatics - Charging an electroscope by contact and induction
Electrostatics - Uses of a leaf electroscope

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

- Describe how to charge an electroscope by contact and induction
- Demonstrate charging and discharging an electroscope
- Connect electroscope charging to understanding how photocopiers transfer toner to paper

In groups, learners are guided to:

- Touch charged polythene rod to metallic cap and observe leaf divergence
- Discharge electroscope by touching cap and observe leaf collapse
- Charge electroscope by induction using charged rod and earthing
- Compare charges acquired by contact and induction methods

Why does the electroscope leaf diverge when the cap is touched by a charged object?

- Triumph Physics 10 pg. 208
- Gold leaf electroscope
- Polythene rod
- Glass rod
- Silk and woollen cloth
- Triumph Physics 10 pg. 210
- Various charged objects
- Different materials for testing

- Practical assessment - Oral questions - Observation

Electricity and Magnetism

Electrostatics - Applications of electrostatics in day-to-day life

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

- Describe applications of electrostatics in various fields
- Explain safety measures against electrostatic hazards
- Connect electrostatics to spray painting, photocopiers, air purifiers and lightning protection

In groups, learners are guided to:

- Research applications of electrostatics using digital devices
- Discuss spray guns, photocopiers, fingerprinting and electrostatic precipitators
- Discuss lightning formation and safety measures during thunderstorms
- Present findings on applications and safety to class

How do electrostatic precipitators help reduce air pollution from factory emissions?

- Triumph Physics 10 pg. 212
- Digital devices
- Reference books
- Manila paper

- Written assignments - Oral questions - Observation

Electricity and Magnetism

Electrostatics - Applications of electrostatics in day-to-day life

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

- Describe applications of electrostatics in various fields
- Explain safety measures against electrostatic hazards
- Connect electrostatics to spray painting, photocopiers, air purifiers and lightning protection

In groups, learners are guided to:

- Research applications of electrostatics using digital devices
- Discuss spray guns, photocopiers, fingerprinting and electrostatic precipitators
- Discuss lightning formation and safety measures during thunderstorms
- Present findings on applications and safety to class

How do electrostatic precipitators help reduce air pollution from factory emissions?

- Triumph Physics 10 pg. 212
- Digital devices
- Reference books
- Manila paper

- Written assignments - Oral questions - Observation