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A tuning fork of known frequency 256 Hz ...

A tuning fork of known frequency 256 Hz makes 5 beats per second with the vibrating string of a piano. The beat frequency decreases to 2 beats per second when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was :

A

261Hz

B

258Hz

C

254Hz

D

251Hz

Text Solution

Verified by Experts

The correct Answer is:
D
Let frequency of piano string `= v_(P)`
`V_(P) = 251 Hz or 261 Hz`
On increasing tension,` V_(P)` will increase `rArr V_(P)` can only be 251Hz
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