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

A pipe 30 cm long is open at both ends. Which harmonic mode of the pipe is resonantly excited by a 1.1 kHz source ? (Take speed of sound in air `= 330 ms^(-1)`)

A

First

B

Second

C

Third

D

Fourth

Text Solution

Verified by Experts

The correct Answer is:
B
For `n^(th)` harmonic
`f_(n)=(nv)/(2l).n=(2lf_(n))/(v)=(2xx0.3xx1100)/(330)=2` or second.
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