A source of sound \( S \) is moving with a velocity of \( 50 \mathr...

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A source of sound \( S \) is moving with a velocity of \( 50 \mathrm{~m} / \mathrm{s} \) 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 (Take velocity of sound in air is \( 350 \mathrm{~m} / \mathrm{s} \) )
[JEE (Main) 2019]
(a). \( 857 \mathrm{~Hz} \)
(b) \( 807 \mathrm{~Hz} \)
(c) \( 1143 \mathrm{~Hz} \)
(d) \( 750 \mathrm{~Hz} \)
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