NEET Physics Waves Questions Solved

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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

(1) First

(2) Second

(3) Third

(4) Fourth

(1) Fundamental frequency of open pipe

n1=v2l=3302×0.3=550 Hz

Second harmonic = 2×n1=1100 Hz=1.1  kHz

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