A vibrating string fork and a vibrating ...

A vibrating string fork and a vibrating sonometer wire of length 30 cm produce 4 beats/ sec. if the length of the wire is increases to 32 cm, again 4 beats/ sec. heard, what is the frequency of the tuning fork ?

94 Hz

110 Hz

124 Hz

150 Hz

Text Solution

Verified by Experts

The correct Answer is:

`n_(1) l_(1) = n_(2)l_(2)`
` (n + 4) 30 = (n - 4) xx 32 :. n = 124` Hz

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