A source of sound \( S \) is moving with a velocity \( 50 \mathrm{~...

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A source of sound \( S \) is moving with a velocity \( 50 \mathrm{~m} / \mathrm{s} \) towards a stationary observer. The observer measures the
\( \mathrm{P} \) frequency of the source as \( 1000 \mathrm{~Hz} \). What will be the

W apparent frequency of the source when it is moving away from the observer after crossing him ? The velocity of sound in the medium is \( 350 \mathrm{~m} / \mathrm{s} \)
[MP PMT 1994; AIIMS 2010]
(a) \( 750 \mathrm{~Hz} \)
(b) \( 857 \mathrm{~Hz} \)
(c) \( 1143 \mathrm{~Hz} \)
(d) \( 1333 \mathrm{~Hz} \)
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