Question

The lengths of two organ pipes open at both ends are
`L and L + d`. If they are sounde together, then the
beat frequency will be
A. `(YV)/(2l(l+y))`
B. `(YV)/(2l^2)`
C. `(YV)/(2l^2(l+y))`
D. `(2l^2)/(YV)`

Answer 1

Correct Answer - A
`n=n_1-n_2`
`=(v)/(2l_1) - (v)/(2l_2)`
`=v/2[1/l - (1)/(l+y)] = v/2[(l+y-l)/(l(l+y))]= (vy)/(2l(l+y))`