Physics (AS & A Level) · May / June 2019 · Paper 13 · Question 24
9702Doppler effect for sound waves
A motor boat vibrates in the water so that it produces water waves of frequency 0.20 Hz. The speed of these waves in the water is 20 m s⁻¹. The motor boat moves with a speed of 5.0 m s⁻¹ directly towards a stationary sailing boat. The Doppler effect equation for sound waves also applies to water waves. What is the frequency with which the waves hit the stationary sailing boat?
- A0.15 Hz
- B0.16 Hz
- C0.25 Hz
- D0.27 Hz
As printed in the paper
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Correct answer: D. 0.27 Hz
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