A source of sound of frequency \( 256 \mathrm{~Hz} \) is moving rap...

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A source of sound of frequency \( 256 \mathrm{~Hz} \) is moving rapidly towards a wall with a velocity of \( 5 \mathrm{~m} / \mathrm{s} \). The speed of sound is
\( \mathrm{P} \) \( 330 \mathrm{~m} / \mathrm{s} \). If the observer is between the wall and the source, then beats per second heard will be
[UPSEAT 2002]
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(a) \( 7.8 \mathrm{~Hz} \)
(b) \( 7.7 \mathrm{~Hz} \)
(c) \( 3.9 \mathrm{~Hz} \)
(d) Zero
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