The fundamental frequency in an open organ pipe is equal to the thi...

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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 \( 20 \mathrm{~cm} \), the length of the open organ pipe is
[NEET 2018]
\( \mathrm{P} \)
(a) \( 13.2 \mathrm{~cm} \)
(b) \( 8 \mathrm{~cm} \)
(c) \( 12.5 \mathrm{~cm} \)
(d) \( 16 \mathrm{~cm} \)
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