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Physics (AS & A Level) · May / June 2024 · Paper 13 · Question 24

9702Doppler effect for sound waves

An ambulance siren emits a sound with a single frequency f. The ambulance travels towards, passes close to, and then travels away from a stationary observer. Which statement describes the frequency of the sound detected by the observer as the ambulance passes the observer?

  1. Aequal to f and decreasing
  2. Bequal to f and increasing
  3. Cgreater than f and constant
  4. Dless than f and constant

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Correct answer: A. equal to f and decreasing

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