Two sources \( P \) and \( Q \) produce notes of frequency \( 660 \...

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Two sources \( P \) and \( Q \) produce notes of frequency \( 660 \mathrm{~Hz} \) each. A listener moves from \( P \) to \( Q \) with a speed of \( 1 \mathrm{~ms}^{-1} \). If
\( \mathrm{P} \) the speed of sound is \( 330 \mathrm{~m} / \mathrm{s} \), then number of beats heard by the listener per second will be
[NEET (Karnataka) 2013]
W
(a) 4
(b) 8
(c) 2
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