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Question 22
a.

Sound waves consist of compressions and rarefactions.

Explain the terms compression and rarefaction. Give your explanation in terms of the spacing of molecules and the pressure for sound waves in air.

[2]
b.

A loudspeaker emits a sound with a frequency of 5.0 kHz5.0\text{ kHz}5.0 kHz. The speed of sound in air is 340 m/s340\text{ m/s}340 m/s.

Calculate the wavelength of the sound.

[2]
c.

The frequency of the sound emitted by the loudspeaker is changed to 3.8 kHz3.8\text{ kHz}3.8 kHz and the amplitude of the sound is increased.

Without calculation, state what happens to:

  1. the speed of the sound
  2. the wavelength of the sound
[2]
Markscheme

Sound Questions

  1. IGCSE
  2. /Physics
  3. /Sound

295 exam-style questions on CIE IGCSE Physics Sound, covering Sound. Each one has a worked solution and a mark scheme showing where the marks go.

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