When a train is approaching the stationa...

When a train is approaching the stationary observer, the apparent frequency of the whistle observed as 100 Hz, while when it has passed away from the observer with same speed, it is 50 Hz. Calculate the frequency of the whistle when the observer moves with the train V = 330 m/s)

33.3 Hz

50 Hz

66.6 Hz

75 Hz

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