1.

A pipe of 30 cm long and open at both the ends produces harmonics. Which harmonic mode of pipe resonates a 1.1 kHz source ? Given speed of sound in air =330 ms^(-1).

Answer»

FIFTH harmonic
Fourth harmonic
Third harmonic
Second harmonic

Solution :`f_(n) = n XX f_(1)`
`f_(n) = n xx ((v)/(2L))`
`1, 100 = n xx (330)/(2 xx 0.30)`
n = 2


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