A-LevelPhysicsWaves9702/12 · Oct/Nov 2023 · Q221 Mark

A source of sound waves is moving at a constant speed directly towards a stationary observer. The sound waves have a speed of 340 m s⁻¹ and a frequency of 480 Hz. The observer hears sound waves of frequency 650 Hz. What is the speed of the source?

A89 m s⁻¹

B120 m s⁻¹

C250 m s⁻¹

D340 m s⁻¹

✓ Correct answer

A: 89 m s⁻¹

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