A-LevelPhysicsWaves9702/12 · May/June 2022 · Q241 Mark
A source emits a sound wave of a single frequency. The Doppler effect causes a different frequency of sound to be heard by a stationary observer. What is a requirement for the Doppler effect to occur?
Asource that is moving as it produces the sound wave
Bsource that produces a polarised sound wave
Csource that produces a sound wave of changing amplitude
Dsource that produces a sound wave of changing frequency
✓ Correct answer
A: source that is moving as it produces the sound wave
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