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Physics (AS & A Level) · Oct / Nov 2024 · Paper 13 · Question 24

9702Doppler effect for sound waves

A source of sound waves of constant frequency is travelling as shown. In which situation would the stationary observer detect a sound with the lowest frequency?

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

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

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