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Physics (AS & A Level) · May / June 2022 · Paper 12 · Question 24

9702Doppler effect for sound waves

A source emits a sound wave of a single frequency. The Doppler effect causes a different frequency of sound to be heard by a stationary observer. What is a requirement for the Doppler effect to occur?

  1. Aa source that is moving as it produces the sound wave
  2. Ba source that produces a polarised sound wave
  3. Ca source that produces a sound wave of changing amplitude
  4. Da source that produces a sound wave of changing frequency

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Correct answer: A. a source that is moving as it produces the sound wave

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