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A vibrating string of certain length l u...

A vibrating string of certain length `l` under a tension `T` resonates with a mode corresponding to the first overtone (third harmonic) of an air column of length `75cm` 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 `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

Text Solution

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The correct Answer is:
A
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