Physics (AS & A Level) · May / June 2025 · Paper 12 · Question 26
9702Doppler effect for sound waves
A buzzer emitting sound of frequency 846 Hz is attached to a string and rotated in a horizontal circle. The linear speed of the buzzer is 25.0 m s⁻¹. The speed of sound is 340 m s⁻¹. What is the maximum frequency heard by the observer?
- A783 Hz
- B788 Hz
- C908 Hz
- D913 Hz
As printed in the paper
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Correct answer: D. 913 Hz
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