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A boy sitting on a swing which is moving...

A boy sitting on a swing which is moving to an angle of `30^@` from the vertical is blowing a whistle which has a frequency of 100 Hz. The whistle is at 2.0 m from the point of support of the swing. A girl stands in front of the swing. The maximum frequency she will hear is nearly `10^x` Hz (velocity of sound 330 m/s,g= `9.8 m//s^2`). Find x

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