Physics (AS & A Level) · Oct / Nov 2018 · Paper 13 · Question 24
9702Doppler effect for sound waves
A bat flies directly towards a fixed ultrasound detector at a speed of 25.0 m s–1 emitting pulses of ultrasound of frequency 40.0 kHz. The speed of sound in air is 330 m s–1. Which frequency does the ultrasound detector record?
- A37.0 kHz
- B37.2 kHz
- C43.0 kHz
- D43.3 kHz
As printed in the paper
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Correct answer: D. 43.3 kHz
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