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 [NEET 2018]

Question

Accepted Answer

Correct answer: C. (c) Fundamental frequency for an open organ pipe is given as f_1= v2L Third harmonic for a closed organ pipe is given as f^ '= 3v4L^ ' According to the question, f=f^ ' ⇒ v2L= 3v4L^ 'L= 23L^ ' Given, L^ '=20 cm ⇒L= 23 20 cm= 403 cm=13.3 cm

$The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20 cm, the length of the open organ pipe is [NEET 2018]$

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