W.3(1) - ORGAN PIPES

Vibrations within an organ pipe produce sound waves. Loud tones can be produced by blowing on the organ pipes or connecting them through a rubber hose to the air supply faucet. Three different tones are available and one wooden pipe with sliding piston, where the resonant cavity's length can be varied to provide tones of varying pitch. In conjuction with a microphone, amplifier, and oscilloscope, the relationship between wave frequency and tone can be investigated.

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W.3(2) - ELECTRIC BUZZER IN VACUUM

Vibrations within an organ pipe produce sound waves. Loud tones can be produced by blowing on the organ pipes or connecting them through a rubber hose to the air supply faucet. Three different tones are available and one wooden pipe with sliding piston, where the resonant cavity's length can be varied to provide tones of varying pitch. In conjuction with a microphone, amplifier, and oscilloscope, the relationship between wave frequency and tone can be investigated.

W.3(3) - RESONANCE APPARATUS

Determine the standing wavelength of sound, using a tuning fork with a known frequency and a water filled tube. A tall stand holds a small water resevoir near its top and a 1.2 m plastic tube connected at its lower end to the bottom of the water's resevoir. The resevoir can be moved up and down the stand so that the tube's water level can be adjusted. A loud sound will be emmitted when a vibrating tuning fork is brought near the tube's opening and the water level is adjusted for the resonant cavity length. It can be used for resonance demonstrations and to determine the velocity of sound on air.