The fundamental frequency in an open...

The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe . If the length of the closed organ pipe . If the length of the closed organ of a closed organ pipe is 20 cm , the length of the open organ pipe is

A

`12.5 cm`

B

`8 cm `

C

`13.2 cm `

D

`16 cm`

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