Vibrating tuning fork of frequency \( n \) is placed near the open ...

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Vibrating tuning fork of frequency \( n \) is placed near the open end of a long cylindrical tube. The tube has a side opening and is fitted with a movable reflecting piston. As the piston is
\( \mathrm{P} \) moved through \( 8.75 \mathrm{~cm} \), the intensity of sound changes

W from a maximum to minimum. If the speed of sound is 350 \( \mathrm{m} / \mathrm{s} \), then \( n \) is
(a) \( 500 \mathrm{~Hz} \)
(b) \( 1000 \mathrm{~Hz} \)
(c) \( 2000 \mathrm{~Hz} \)
(d) \( 4000 \mathrm{~Hz} \)
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