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A train sounding a horn of frequency 100...

A train sounding a horn of frequency 1000 Hz crosses a station at a unifrom velocity of 50 km ` h^(-1)` Calculate the frequency of the whistle relative to a listener, standing on the platform, before and after the crossing of the station . (velocity of sound = 340 m ` s^(-1)`)

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The correct Answer is:
[ 1042.6 Hz , 960.8 Hz]
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