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An air-filled pipe is found to have successive harmonics at 1120 hz , 1440 hz , and 1760 hz . it is unknown whether harmonics below 1120 hz and above 1760 hz exist in the pipe. what is the length of the
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Jun 25, 2019
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An air-filled pipe is found to have successive harmonics at 1120 hz , 1440 hz , and 1760 hz . it is unknown whether harmonics below 1120 hz and above 1760 hz exist in the pipe. what is the length of the pipe?
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Johnson
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Fundamental frequency:
1/2 * (1440-1120) = 1/2(1760-1440) = 160 Hz
Wavelength = Speed/Fundamental frequency.
Note, speed of waves in air is approximate to 340 m/s
Wavelength = 340/160 = 2.125 m
Length of the pipe = 0.25*wavelength = 0.25*2.125 = 0.53125 m = 53.125 cm
Jeh
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Jun 29, 2019
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