1.

Two organ pipes, each closed at one end, give 5 beats `s^(-1)` when emitting their fundamental notes. If their lengths are in the ratio `50 : 51, ` their fundamental frequencies areA. 250, 255B. 255, 260C. 260, 265D. 265, 270

Answer» Correct Answer - A
`n_1l_1= n_2l_2 therefore n_1/n_2 = 51/50`
`therefore n_1 = 51/50n_2, n_1-n_2 =5`
`therefore 51/50 n_2 -n_2 = 5`
`n_2 (51-50) = 5xx50=250Hz`
`n_1 = n_2 + 5 =250+5 = 255Hz`


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