A-LevelPhysicsWaves9702/12 · Feb/Mar 2021 · Q241 Mark

A source of sound of frequency F at point Z is moving at a steady speed. The pattern of the emitted wavefronts is shown. [Figure 24.1] Which row describes the frequencies of the sound heard by stationary observers at X and Y?

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Afrequency heard at X: <F, frequency heard at Y: <F

Bfrequency heard at X: <F, frequency heard at Y: >F

Cfrequency heard at X: >F, frequency heard at Y: <F

Dfrequency heard at X: >F, frequency heard at Y: >F

✓ Correct answer

C: frequency heard at X: >F, frequency heard at Y: <F

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