In a 80 cm long tube that is open at one end and closed on the other and filled with dry air at 20 degree Celsius, the fifth harmonic has a frequency of ____ Hz.
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wavelength= 2*length=2*0.8= 1.6 m
velocity of sound in air =340m/s
fifth harmonic freq= 5*v/wavelength= 5*340/1.6
ans= 1062.5 Hz
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