Physics (AS & A Level) · Oct / Nov 2024 · Paper 12 · Question 26
9702Doppler effect for sound waves
A source of sound emits waves of a constant frequency. The source moves at a constant speed in a straight line relative to a stationary observer. Which velocity of the source gives the smallest observed frequency?
- Aspeed 5 m s⁻¹, away from observer
- Bspeed 10 m s⁻¹, away from observer
- Cspeed 15 m s⁻¹, towards observer
- Dspeed 20 m s⁻¹, towards observer
As printed in the paper
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Correct answer: B. speed 10 m s⁻¹, away from observer
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