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Physics (AS & A Level) · May / June 2016 · Paper 12 · Question 23

9702Doppler effect for sound waves

A source of sound of frequency 1000 Hz moves away from a stationary observer at a speed of 30.0 m s⁻¹. The speed of sound is 330 m s⁻¹. What is the frequency of the sound heard by the observer?

  1. A909 Hz
  2. B917 Hz
  3. C1090 Hz
  4. D1100 Hz

As printed in the paper

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Correct answer: B. 917 Hz

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