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In a guitar , two strings A and b made o...

In a guitar , two strings A and b made of same material are slightly out of tune and produce beats of frequency 6 Hz. when tension in B is slightly decreased, the beat frequency increases to 7 Hz. If the frequency of A is 530 hz, the original frequency of B will be

A

523 hz

B

524 Hz

C

536 Hz

D

537 Hz

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