A tuning fork of frequency \( 256 \mathrm{~Hz} \) is moving \( \mat...

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A tuning fork of frequency \( 256 \mathrm{~Hz} \) is moving
\( \mathrm{P} \) towards a wall with a velocity of \( 5 \mathrm{~m} / \mathrm{s} \). If the speed

W of sound is \( 330 \mathrm{~m} / \mathrm{s} \), then the number of beats heard per second by a stationary observer lying between tuning fork and the wall is
(1) 2
(2) 4
(3) zero
(4) 8
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