NEET | 2018Sound WavesHard

Question

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 :-

Options

A.

13.2 cm

B.

8 cm

C.

12.5 cm

D.

16 cm

Solution

foop = 3fcop
V2loop=3V4looploop=23×loop=23×20=13.3cm

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