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Physics (AS & A Level) · Oct / Nov 2022 · Paper 11 · Question 24

9702Doppler effect for sound waves

A jet aircraft travels at a speed of 0.80v, where v is the speed of sound. The aircraft directly approaches a stationary observer. The frequency of sound emitted by the aircraft is 100 Hz. Which frequency does the observer hear?

  1. A56 Hz
  2. B180 Hz
  3. C400 Hz
  4. D500 Hz

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Correct answer: D. 500 Hz

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