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A pipe 20 cm long is closed at one end. Which harmonic mode of the pipe is resonantly excited by a source of

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A pipe 20 cm long is closed at one end. Which harmonic mode of the pipe is resonantly excited by a source of 1237.5 Hz ?(sound velocity in air = 330 m s-1)

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3rd harmonic [since no=v/4 l=412.5 with v = 330 m/s]

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