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 ( speed of sound = 320 ms-1 ) close to :
a) 12 %
b) 18 %
c) 24 %
d) 6 %
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the answer issssssssssssssssssssssssss 24
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