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A boy riding on his bike is going toward...

A boy riding on his bike is going towards east at a speed of `4 sqrt2` m/s. At a certain point he produces a sound pulse of frequency 1650 Hz that travels in air at a speed of 334 m/s. A second boy stands on the ground 45° south of east from him. Find the frequency of the pulse as received by the second boy.

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1670 Hz
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