A-LevelPhysicsWaves9702/12 · May/June 2019 · Q261 Mark
In one of the first experiments to demonstrate the Doppler effect, a train was filled with trumpeters all playing a note of frequency 440 Hz. The difference in observed frequency of the note as the train directly approached a stationary observer was 22 Hz. The speed of sound was 340 m s⁻¹. At which speed was the train moving?
A15.4 m s⁻¹
B16.2 m s⁻¹
C17.0 m s⁻¹
D17.9 m s⁻¹
✓ Correct answer
B: 16.2 m s⁻¹
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