A tuning fork of frequency \( 392 \mathrm{~Hz} \), resonates with \...

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A tuning fork of frequency \( 392 \mathrm{~Hz} \), resonates with \( 50 \mathrm{~cm} \)
\( \mathrm{P} \) length of a string under tension \( (T) \). If length of the string is decreased by \( 2 \% \), keeping the tension constant, the number
W of beats heard when the string and the tuning fork made to vibrate simultaneously is
[BHU 2004]
(a) 4
(b) 6
(c) 8
(d) 12
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