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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

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The correct Answer is:
80
`(2V)/(2l_1)=V/(4l_2)rArrl_1=4l_2=4xx20`
`l_1=80cm`
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