A-LevelPhysicsWaves9702/12 · Oct/Nov 2024 · Q261 Mark
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/ms⁻¹: 5, direction: away from observer
Bspeed/ms⁻¹: 10, direction: away from observer
Cspeed/ms⁻¹: 15, direction: towards observer
Dspeed/ms⁻¹: 20, direction: towards observer
✓ Correct answer
B: speed/ms⁻¹: 10, direction: away from observer
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