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     EduGorilla 
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    A train is moving on a straight track with a speed of 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)

    Options :-

    1. 6%
    2. 12%
    3. 18%
    4. 24%
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