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A 30 cm long pipe is open at both ends. ...

A 30 cm long pipe is open at both ends. Which harmonic mode of the pipe is resonantly excited by a `1. 65` KHz source ? [ Speed of sound in air = 330 m/s]

A

Third

B

Fourth

C

Second

D

First

Text Solution

Verified by Experts

The correct Answer is:
A
`n_(o) = v/(2L) = (330)/(2 xx 30 xx 10^(-2)) = 550 ` Hz
All harmonics are present for an open pipe.
`N xx 550 = 1.65 xx 10^(3) = 1650`
` :. N = 3 ` ( Third harmonic)
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