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A rocket is moving at a speed of 200 m s...

A rocket is moving at a speed of 200 m `s^(-1)` towards a stationary target. While moving, it emits a wave of frequency 1000 Hz. Some of the sound reaching the target gets reflected back to the rocket as an echo. Calculate (1) the frequency of the sound as detected by the target and (2) the frequency of the echo as detected by the rocket.

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The correct Answer is:
2500 Hz
`v.=v((v+v_0)/(v))`,v=1500 Hz .
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