![]() ![]() A loud sound will be produced when a vibrating tuning fork is brought near the tube's opening and the water level is adjusted for the resonant cavity length. The reservoir can be moved up and down the stand so that the tube's water level can be adjusted. It consists of a tall stand holding a small water reservoir near its top and a 1.2 m plastic tube connected at its lower end to the bottom of the water's reservoir. This apparatus is used to determine standing wavelength of sound, using a tuning fork with a known frequency and a water filled tube. The second instrument is thus set into vibration by the first instrument. This air column in the second box causes the tuning fork to vibrate. This vibration creates strong vibration in the box to which the fork is attached. The air column will also be set in vibration and all the air immediately around will be set in vibration. This throws the box to which the fork is attached into strong vibration. Now strike one fork sharply with the provided rubber hammer. Place the resonance boxes aligned and with their openings facing each other. That is, the box acts as a closed organ pipe and the length of the box corresponds approximately to one-quarter of a wave in air of the sound produced by the fork. The size of the air column is chosen so that it will reinforce the same sound that the tuning fork gives. ![]() These tuning forks (286 Hz) are mounted on resonance boxes. ![]()
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