When a train is approaching the observer, the frequency of the whisle is 100cps, while when it has passed the observer, it is 50cps. Calculate the frequency when the observer moves with the train

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Q. When a train approaches a stationary observer, the apparent frequency of the whistle is

n^{'}

and when the same train recedes away from the observer, the apparent frequency is

n^{''}

. Then, the apparent frequency

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