Bring a tuning fork that vibrates at a frequency of 500 Hz. To muzzle the mouth of the tube ends (as shown) will have to fill the glass tube a few cubic centimeters. The noise than usual coming out of the tubes. The glass tube is located on the ground level. Cross sectional area 10 cm long, 20 cm and the speed of sound in air, as it is 350 meters per second.
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