First slide
Beats
Question

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 :

Easy
Solution

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

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