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A pipe is open at both ends and 40 cm of its length is in resonance with an external frequency `1.1` kHz. If the speed of sound is `330ms^(-1)`, which harmonic is in resonance?A. FirstB. SecondC. ThirdD. none |
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Answer» Correct Answer - d Fundamental frequencyu of open pipe First harmonic `=n_(1)=v/(2l)=(330)/(2xx0.4)=412.5` Hz Frequency of nth harmonic of vibration `v_(n)=n(v//2l)` Given `v_(n)=1.1kHz = 1100 Hz` `rArr nxx (412.5)=1100 rArr n = 2.666` `therefore` No harmonic is in resonance |
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