A vibrating tuning fork of frequency \( \mathrm{n} \) is placed near the open end of a long cyli...
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1A vibrating tuning fork of frequency \( \mathrm{n} \) is placed near the open end of a long cylindrical tube. The tube
\( \mathrm{P} \) has a side opening and is also fitted with a movable reflecting piston. As the piston is moved through \( 8.75 \)
W. \( \mathrm{cm} \), the intensity of sound changes from a maximum to minimum. If the speed of sound is 350 metre per second, then \( \mathrm{n} \) is -
(1) \( 500 \mathrm{~Hz} \)
(2) \( 1000 \mathrm{~Hz} \)
(3) \( 2000 \mathrm{~Hz} \)
(4) \( 4000 \mathrm{~Hz} \)
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