1.

A somometer wire produces 2 beats per second with a tuning fork, when the length of the wire is either 102cm or 104 cm . The frequency of the tuning fork isA. 206 HzB. 204 HzC. 200 HzD. 198 Hz

Answer» Correct Answer - A
`n_1 gt n gt n_2`
`n_1=n=2`
`(n-n_2=2)/(n_1-n_2=4)`
`n_1/n_2 = l_2/l_1= 104/102`
`(n_1-n_2)/(n_2) = (104-102)/(102)`
`(4)/(n_2) = 2/102`
`n_2 = 102xx1=204`
`n=n_2+2 = 204+2 = 206 Hz.`


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