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A train is moving on a straight track wi...

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 correct Answer is:
A
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