1.

A sonometer wire is in unison with a tuning fork. When the length of the wire is increased by 2% , the number of beats heard per second is 5, then the frequency of the fork will beA. 245HzB. 250HzC. 255HzD. 260Hz

Answer» Correct Answer - C
`l_2=1.02l_1 " and " n_1lamda_1 = n_2lamda_2`
`n_1/n_2 = 1.02 therefore n_1-n_2=5`
`1.02n_2-n_2= 5`
`0.02n_2=5`
`therefore n_2 = 250Hz`
`n_1=n_2+5 = 250+5=255Hz`


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