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GCSE Physics · key term
Repeated changes in pressure that travel through a medium as a sound wave.
Used by AQA
Specification 4.7.3.3 · Paper 2
Revise: MicrophonesSound is carried through air as a sequence of pressure variations. When these variations reach a moving-coil microphone, they push and pull on a thin diaphragm, causing it to vibrate backwards and forwards.
Build an explanation as a causal chain: sound pressure variations → diaphragm vibrates → coil moves through the magnetic field → a potential difference is induced → a varying current flows in a complete circuit.
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