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Physics (AS & A Level) · May / June 2018 · Paper 13 · Question 23

9702Doppler effect for sound waves

A police car travels at a velocity of 30.0 m s⁻¹ directly towards a stationary observer. The horn of the car emits sound of frequency 2000 Hz. The speed of sound is 340 m s⁻¹. What is the frequency of the sound heard by the observer?

  1. A1840 Hz
  2. B2000 Hz
  3. C2180 Hz
  4. D2190 Hz

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Correct answer: D. 2190 Hz

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