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Question

A long train is moving on a circular track. The speed of train remains constant during motion. Engine of the train is emitting a sound of frequency $${f}_{0}$$. The frequency observed by the guard at the sea level of the train is (length of the train is less than $$\cfrac{\pi R}{2}$$)

A
is equal to $${f}_{0}$$
B
less than $${f}_{0}$$
C
is mass than $${f}_{0}$$
D
may be greater than, less than or equal to $${f}_{0}$$ depending on speed and length of train
Solution
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Correct option is A. is equal to $${f}_{0}$$

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