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A closed organ pipe of length L and an o...

A closed organ pipe of length L and an open organ pipe contain gases of densities pi and p2 respectively. The compressibility of gases is equal in both the pipes. Both the pipes are vibrating in their first overtone with same frequency. The length of the open organ pipe is

A

`frac(L)(3)`

B

`frac(4L)(3)`

C

`frac(4L)(3) sqrt frac(rho_1)(rho_2)`

D

`frac(4L)(3) sqrt frac(rho_2)(rho_1)`

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