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A vibrating string of certain length under a tension T resonates with a mode corresponding...

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A vibrating string of certain length under a tension T resonates with a mode corresponding to the first overtone third harmonic of an air column of length 75 cm inside a tube closed at one end The string also generates 4 beats per second when excited along with a tuning fork of frequency n Now when the tension of the string is slightly increased the number of beats reduces to 2 per second Assuming the velocity of sound in air to be 340 m s the frequency n of the tuning fork in Hz is A 344 B 336 C 117 3 D 109 3

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