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A metal wire of diameter 1 mm is held on...

A metal wire of diameter 1 mm is held on two knife edges separated by a distance of 50 cm. The tension in the wire is 100 N. The wire vibrates with its fundamental frequency and a vibrating tuning fork together produce `5 beat/s`. The tension in the wire is then reduced to 81 N. When the two are excited , beats are heard at the same rate, then the frequency of the fork will be

A

`45 Hz`

B

`95 Hz`

C

`100 Hz`

D

`50 Hz`

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