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a train is running at the speed of 90km/hour towards a platform blowing whistle. A person at platform heard the whistle at the frequency of 650 Hz. the speed of wave is 320m/s. what is the real frequency of the wave?

a train is running at the speed of 90km/hour towards a platform blowing whistle. A person at platform heard the whistle at the frequency of 650 Hz. the speed of wave is 320m/s. what is the real frequency of the wave?

Grade:12th pass

1 Answers

Jay Sawant
37 Points
3 years ago
This effect of hearing a freq other original freq is called Doppler effect.
Here train(source) is moving towards stationary observer.
90km/hr=25m/s
Applying Doppler formula
Apparent freq=original freq (wave speed/wave speed-source speed)
650=f(320/320-25)
f = 599.7 Hz

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