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A tuning fork of frequency 512 Hz is vi...

A tuning fork of frequency 512 `Hz` is vibrated with a sonometer wire and 6 beats per second are heard. The beat frequency reduces if the tension is the string is slightly increased . The original frequency of vibration of the string is

A

`506 Hz`

B

`512 Hz`

C

`518 Hz`

D

`524 Hz`

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