A-LevelPhysicsWaves9702/12 · May/June 2023 · Q221 Mark
A source X emits a sound wave of constant frequency f. The wave is subsequently received at a stationary detector Y. The frequency of the wave that is detected by Y is less than f. What could be the reason for this?
ABetween X and Y, the wave undergoes diffraction.
BBetween X and Y, the wave undergoes reflection.
CX is moving away from Y.
DX is moving towards Y.
✓ Correct answer
C: X is moving away from Y.
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