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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 frequency heard by a person standing near the track as the train passes him is (speed of sound =$320\;ms^{-1})$ close to :

$\begin{array}{1 1} 18 \% \\ 24\% \\ 6\% \\ 12\% \end{array} $

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