Question

A train moving at 40 m/s, passes by a stationary observer, emitting a whistle of frequency
300 Hz. If the velocity of sound wave is 340 m/s, then the change in the apparent frequency
of the sound, just before and after the train passes by the observer will be nearly
(A) 32 Hz
(B) 72 Hz
(C) 40 Hz
(D) 8 Hz​

Answer 1

Answer:

72hz

Explanation:

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Answer 2

Answer:

a........................ .......