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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

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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)`)
A. First
B. Second
C. Third
D. Fourth
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Correct Answer - A
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