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  3. A train is moving on a straight track with speed 20ms−1. It is blowing its whistle at the frequency of 1000 Hz. The percentage change in the
# Engineering

A train is moving on a straight track with speed 20 ms-1. It is blowing its whistle at the frequency of 1000 Hz. The Percentage change in the frequency heard by a person standing near the track as the train passes him is close to (speed of sound = 320 ms-1)

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