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Physics (AS & A Level) · May / June 2025 · Paper 14 · Question 22

9702Doppler effect for sound waves

A vehicle is moving with a speed of 30.0 m s–1 directly towards a stationary observer. The horn of the vehicle emits sound of frequency 440 Hz. The speed of sound in air is 340 m s–1. What is the frequency of the sound heard by the observer?

  1. A401 Hz
  2. B404 Hz
  3. C479 Hz
  4. D483 Hz

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Correct answer: D. 483 Hz

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