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NEET 2018 Physics question

PhysicsWavesNEET 2018

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

Answer: (3)

Solution

A closed pipe supports only odd harmonics, (). Its third harmonic is with cm. The fundamental of an open pipe of length is $f' =

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Question ID VK-092196