Physics · Wave Optics and Acoustics
A boy standing on a platform observes the frequency of a train horn as it passes by. The percentage change in the frequency noticed as the train approaches and recedes from him with a velocity of 108 km/h is (speed of sound in air = 330 ms -1 ):
- 115.23%
- 221.27%
- 316.67%
- 418.33%✓
Correct answer
18.33%
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