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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
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A train moving at 40 m/s, passes by a stationary observer, emitting a whistle of frequency 300 Hz.
