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Waves in air, fluids and solids
Waves in air, fluids and solids links observable wave behaviour to precise GCSE quantities: amplitude, wavelength, frequency, period and wave speed. Students interpret transverse and longitudinal wave motion, use v = f? and f = 1/T, and connect graph features such as crest spacing or oscillation timing to physical meaning. The topic also covers reflection, refraction, sound, ultrasound and required-practical measurement, with careful boundaries between energy transfer and matter transfer, frequency and period, and amplitude and wavelength. Strong answers use evidence from ripple tanks, oscilloscope traces, wavefront diagrams or ray-box observations, then state the relevant units and physical consequence. Calculation questions should show formula selection, substitution, conversion and final units rather than isolated arithmetic. Students should also justify each observation using precise wave vocabulary and units.
73
Objectives
365
Flashcards
365
Questions
90 min
Study time
AQAGCSEPhysicsWaves
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Syllabus checklist
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73 objective pages available
Transverse and longitudinal waves12 objectives
- Describe a wave as a disturbance that transfers energy from one place to another.
- State that waves transfer energy without transferring matter overall.
- Describe oscillations in a transverse wave as perpendicular to the direction of energy transfer.
- Describe oscillations in a longitudinal wave as parallel to the direction of energy transfer.
- Identify ripples on water and electromagnetic waves as examples of transverse waves.
- Identify sound waves in air as examples of longitudinal waves.
- Describe compressions as regions where particles are closer together in a longitudinal wave.
- Describe rarefactions as regions where particles are further apart in a longitudinal wave.
- Distinguish the direction of vibration from the direction of wave travel.
- Explain why mechanical waves need a medium.
- Explain why electromagnetic waves can travel through a vacuum.
- Use diagrams to distinguish transverse and longitudinal wave patterns.
Properties of waves22 objectives
- Define amplitude as the maximum displacement of a point on a wave from its undisturbed position.
- Define wavelength as the distance from a point on one wave to the equivalent point on the adjacent wave.
- Define frequency as the number of waves passing a point each second.
- State that frequency is measured in hertz.
- Define period as the time taken for one complete wave to pass a point.
- Use the relationship period = 1 divided by frequency.
- Calculate period from frequency.
- Calculate frequency from period.
- Define wave speed as the speed at which energy is transferred through a medium or through space.
- Use the equation wave speed = frequency x wavelength.
- Calculate wave speed from frequency and wavelength.
- Calculate frequency from wave speed and wavelength.
- Calculate wavelength from wave speed and frequency.
- Identify wavelength in metres, frequency in hertz and wave speed in metres per second.
- Apply MS 3b and MS 3c skills when rearranging wave speed and frequency-period equations.
- Apply MS 4a skills when interpreting wave graphs and wavefront diagrams.
- Required practical: make observations to identify suitable apparatus for measuring wave frequency, wavelength and speed in a ripple tank.
- Required practical: make observations to identify suitable apparatus for measuring wave frequency, wavelength and speed in a solid.
- Required practical: measure wavelength using a ruler or scaled image of wavefronts.
- Required practical: determine frequency using an oscillator, signal generator or timing method where appropriate.
- Required practical: calculate wave speed from measured frequency and wavelength.
- Required practical: evaluate uncertainty and repeatability in wave-speed measurements.
Reflection and refraction of waves15 objectives
- Describe reflection as a change in direction when a wave meets a boundary and remains in the same medium.
- State that the angle of incidence equals the angle of reflection for reflection from a plane surface.
- Draw and label the normal, incident ray and reflected ray in a reflection diagram.
- Explain refraction as a change in direction when a wave changes speed at a boundary between media.
- Describe how refraction depends on a change in wave speed.
- Distinguish reflection from refraction in wave-boundary contexts.
- Use wavefront diagrams to show reflection at a plane boundary.
- Use ray diagrams to show refraction at a boundary between transparent materials.
- Required practical: investigate reflection of light from different types of surface.
- Required practical: investigate refraction of light by different substances.
- Required practical: measure angles of incidence, reflection and refraction using a protractor.
- Required practical: draw ray diagrams accurately from experimental data.
- Explain why repeated angle measurements improve reliability in reflection and refraction practicals.
- Identify sources of uncertainty when tracing rays through transparent blocks.
- Apply WS and MS skills when recording, plotting and interpreting reflection and refraction data.
Sound waves10 objectives
- Describe sound waves in air as longitudinal waves.
- Explain that sound waves are caused by vibrating objects.
- Describe how sound waves travel through a medium by compressions and rarefactions.
- Explain why sound cannot travel through a vacuum.
- Link higher frequency sound waves to higher pitch.
- Link greater amplitude sound waves to louder sounds.
- Describe echoes as reflected sound waves.
- Interpret simple oscilloscope traces for sound waves.
- Distinguish pitch from loudness using frequency and amplitude.
- Explain why the speed of sound differs in solids, liquids and gases.
Waves for detection and exploration (physics only)14 objectives
- (Physics only) Define ultrasound as sound with frequency above the upper limit of human hearing.
- (Physics only) Explain that ultrasound waves are partially reflected at boundaries between media.
- (Physics only) Use reflected ultrasound pulses to determine distance from time delay and wave speed.
- (Physics only) Describe how ultrasound can be used for medical imaging.
- (Physics only) Describe how ultrasound can be used for industrial flaw detection.
- (Physics only) Explain why ultrasound can detect boundaries inside materials or the body.
- (Physics only) Distinguish ultrasound from audible sound using frequency.
- (Physics only) Describe seismic P-waves as longitudinal waves.
- (Physics only) Describe seismic S-waves as transverse waves.
- (Physics only) Explain that P-waves can travel through solids and liquids.
- (Physics only) Explain that S-waves can travel through solids but not liquids.
- (Physics only) Describe how seismic waves provide evidence for the structure of the Earth.
- (Physics only) Interpret simple time-delay data for echoes or seismic waves.
- (Physics only) Apply wave speed reasoning to detection and exploration contexts.
Key terms
disturbancelongitudinal waves boundary meaningstatetransverse wavelongitudinal wavesound waves boundary meaningvibrationmechanical waveelectromagnetic waveamplitudeamplitude boundary meaningwavelength
Exam tips
- Transverse and longitudinal waves exam tip 1: Use precise subject-specific vocabulary when you explain how to describe a wave as a disturbance that transfers energy from one place to another..
- Transverse and longitudinal waves exam tip 1: Use precise subject-specific vocabulary when you explain how to state that waves transfer energy without transferring matter overall..
Common mistakes
- Transverse and longitudinal waves common mistake 1: Answer by clearly explaining how to describe a wave as a disturbance that transfers energy from one place to another..
- Transverse and longitudinal waves common mistake 1: Answer by clearly explaining how to state that waves transfer energy without transferring matter overall..
Practice preview
- Which option best matches the approved learning objective for Transverse and longitudinal waves (1)?
- In Waves in air, fluids and solids, which option best shows process reasoning for the objective: Describe a wave as a disturbance that transfers energy from one place to another.?
- For Transverse and longitudinal waves, a student is working with a ray-box experiment at a glass boundary. Which option best uses normal lines, angles and direction changes to describe a wave as a disturbance that transfers energy from one place to another.?
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