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The fundamental frequency of a closed or...

The fundamental frequency of a closed organ pipe of length `20 cm` is equal to the second overtone of an organ pipe open at both the ends. The length of organ pipe open at both the ends is

A

`100 cm`

B

`120 cm`

C

`140 cm`

D

`80 cm`

Text Solution

Verified by Experts

`(v)/(4 l_(1)) = 3 . (v)/(2 l_(2))`
`l_(2) = 6 l_(1) = 6 xx 20`
`= 120 cm`
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