1.

A sonometer wire of length `l_(1)`is in reasonance with a frequency 250 Hz. If the length of wire is increasesed then 2 beats per second are heard. What is ratio of the lengths of the wire ?A. 125:124B. 250:313C. `5:3`D. `41:57`

Answer» Correct Answer - A
`n_1/n_2 = l_2/l_1`
`250/248 = l_2/l_1`
`125/124 = l_2/l_1`


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