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A rocket is moving at a speed of 220 m s...

A rocket is moving at a speed of 220 m `s^(-1)` towards a stationary target, emits a sound of frequency 1000 Hz. Some of the sound reaching the target gets reflected back to the rocket as an echo. The frequency of the echo as detected by the rocket is
(Take velocity of sound = 330 m `s^(-1)`)

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