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A source emitting sound at frequency 400...

A source emitting sound at frequency 4000 Hz, is moving along the Y-axis with a speed of `22 m s^-1`. A listener is situated on the ground at the position (660 m, 0). Find the frequency of the sound received by the listener at the instant the source crosses the origin. Speed of sound in air` = 330 m s^-1`.

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The correct Answer is:
A, D
Required frequency
`=(v+0)/(v-v_scostheta)xxn_0`
`=330/(330-22x(44.99/661.47))x4000
`=4017.85~~4018Hz`
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