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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

256 + 2 H

B

256 + 2 H

C

256 – 2 H

D

256 – 5 H

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The correct Answer is:
D
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