NEET 2020 Physics 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 :
Answer: (B)
Solution
Beats = 6 Hz so or 536 Hz. Lowering tension of B lowers ; beats rise to 7 only if Hz.