1.

Two closed organ pipes have lengths L and `L+X`. When two pipes are sounded together , the beat frequency isA. `(YV)/(4l(l+y))`B. `(YV)/(2l(l+y))`C. `(YV)/(2l^2(l+y))`D. `(2l^2)/(YV)`

Answer» Correct Answer - A
`n=n_1-n_2`
`=(v)/(4l_1) - (v)/(4l_2)`
`=v/4[1/l - (1)/(l+y)] = v/4[(l+y-l)/(l(l+y))]= (vy)/(4l(l+y))`


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