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Physics (AS & A Level) · Feb / March 2017 · Paper 12 · Question 25

9702Doppler effect for sound waves

A source of sound waves is travelling as shown. In which situation would the stationary observer detect the largest decrease in the observed frequency?

  1. Aobserver and source, source moving left at 5 m s⁻¹
  2. Bobserver and source, source moving left at 10 m s⁻¹
  3. Cobserver and source, source moving right at 5 m s⁻¹
  4. Dobserver and source, source moving right at 10 m s⁻¹

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Correct answer: D. observer and source, source moving right at 10 m s⁻¹

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