Sound waves
I can describe the movement of particles in a sound wave travelling through a solid, liquid or gas, and explain the relative speed of sound in each state of matter.
Sound waves
I can describe the movement of particles in a sound wave travelling through a solid, liquid or gas, and explain the relative speed of sound in each state of matter.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- Sound waves are caused when objects vibrate, causing nearby air particles to vibrate as well.
- As a sound wave travels, each bit of air is vibrating parallel to the direction of wave travel, not travelling forwards.
- Sound is a longitudinal wave: the direction of vibration is parallel to the direction of energy transfer.
- Sound waves are faster in solids/liquids than gases; the particles are very close so vibrations are easily passed on.
- Sound waves are faster in solids than liquids; the strong forces between particles mean vibrations travel even faster.
Keywords
Vibrate - to move back and forth
Sound wave - a ‘pulse’ that travels through a material caused by the vibrations of particles.
Longitudinal wave - a wave, such as a sound wave, where the vibrations are parallel to the direction of energy transfer
Medium - the material through which a wave travels
Common misconception
Sound is an entity/substance of some kind that travels through air, or is somehow 'carried' by air particles or passed between them in collisions. Sound involves air moving away from a sound source.
Use moving animations to show pupils how the travelling pulses of a longitudinal wave are created from particles vibrating back and forth without being transported. Give pupils time to observe the motion of different single particles.
To help you plan your year 9 science lesson on: Sound waves, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 9 science lesson on: Sound waves, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 3 science lessons from the Waves unit, dive into the full secondary science curriculum, or learn more about lesson planning.