Physics (AS & A Level) · Oct / Nov 2025 · Paper 13 · Question 27
9702Doppler effect for sound waves
A dolphin is swimming at a speed of 16.0 m s⁻¹ directly towards a stationary underwater microphone. The dolphin emits a sound of frequency 122 kHz. The speed of sound in water is 1480 m s⁻¹. What is the frequency of sound detected by the microphone?
- A1300 Hz
- B1330 Hz
- C121 kHz
- D123 kHz
As printed in the paper
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Correct answer: D. 123 kHz
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