A train moving at a speed of \( 220 \mathrm{~ms}^{-1} \) towards a ...

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A train moving at a speed of \( 220 \mathrm{~ms}^{-1} \) towards a stationary object emits a sound of frequency \( 1000 \mathrm{~Hz} \). Some of the
\( \mathrm{P} \) sound reaching the object gets reflected back to the train as W echo. The frequency of the echo as detected by the driver of the train is (speed of sound in air is \( 330 \mathrm{~ms}^{-1} \) )
[CBSE PMT (Mains) 2012]
(a) \( 3500 \mathrm{~Hz} \)
(b) \( 4000 \mathrm{~Hz} \)
(c) \( 5000 \mathrm{~Hz} \)
(d) \( 3000 \mathrm{~Hz} \)
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