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0. A long glass tube is held vertically ...

0. A long glass tube is held vertically in water. A tuning fork is struck and held over the tube. Strong resonances are observed at two successive lengths 0.50m and 0.84m above the surface of water. If the velocity of sound is 340 m/s, then the frequency of the tuning fork is 1) 128 Hz 2)256 Hz 3) 384 Hz 4) 500 Hz 6 BEATS

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