A-LevelPhysicsWaves9702/12 · Oct/Nov 2025 · Q271 Mark
A moving source emits sound of frequency 1200 Hz. A stationary observer hears sound of frequency 960 Hz. The speed of the sound is 340 ms⁻¹. What could be the velocity of the source?
A68 m s⁻¹ directly away from the observer
B68 m s⁻¹ directly towards the observer
C85 m s⁻¹ directly away from the observer
D85 m s⁻¹ directly towards the observer
✓ Correct answer
C: 85 m s⁻¹ directly away from the observer
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