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A tuning fork of frequency 512 Hz makes ...

A tuning fork of frequency 512 Hz makes 4 beats per second with the vibrating string of a piano. The beat frequency decreases to 2 beats per sec when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was:

A

`510 Hz`

B

`514 Hz`

C

`516 Hz`

D

`508 Hz`

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