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Q.

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)

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a

First

b

Second

c

Third

d

Fourth

answer is B.

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Detailed Solution

Fundamental frequency (first harmonic) of open pipe n1=v2l=3302×0.3=550 HzSecond harmonic = 2×n1=1100 Hz=1.1 kHz
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