Q.

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 :

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a

524 Hz

b

536 Hz

c

537 Hz

d

523 Hz

answer is A.

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Detailed Solution

When tension decreases frequency decreases then again beat frequency increases. ∴ frequency of B must be 524
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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 :