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The fundamental frequency in an open org...

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 is 20 cm, the length of the open organ pipe is

A

`13.2 m`

B

`8 cm`

C

`12.5 cm`

D

`16 cm`

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The correct Answer is:
A
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