A rocket is moving at a speed of \( 220 \mathrm{~ms}^{-1} \) towards a stationary target, emits ...

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A rocket is moving at a speed of \( 220 \mathrm{~ms}^{-1} \) towards a stationary target, emits a sound of frequency \( 1000 \mathrm{~Hz} \). 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 \( =330 \mathrm{~ms}^{-1} \) )
(a) \( 3500 \mathrm{~Hz} \)
(b) \( 4000 \mathrm{~Hz} \)
(c) \( 5000 \mathrm{~Hz} \)
(d) \( 3000 \mathrm{~Hz} \)
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