The length of vibrating wire is 60cm and...

The length of vibrating wire is 60cm and frequency is 110Hz. When the length is decreased frequency is 110Hz. When the length is decreased by 5 cm, then the number of beats produced is

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The correct Answer is:

`n_2/n_1 = l_1/l_2 = 60/55`
`(n_2-n_1)/(n_1) = (60-55)/(55) = 5/55`
`n_2-n_1 = n_1(1/11) = 110/11=10`

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