Compressed air jet blows through spinning disk with holes.

3C20.30 • B+45+30

diagram for demo

Air through holes on rotating disk generates sound. This apparatus can be mounted horizontally, as shown, or vertically,- with the disk facing the class. Compressed air is blown through the holes in a ring as it rotates, making a sound. The frequency of the sound is higher toward the outer ring, and depends on the speed of rotation.

Related Demos

3C20.16 Steel spring pendulum, inverted, vibrates at 10 Hz. 3C20.40 Savart's wheel: Toothed wheel and cardboard or air jet. 3C20.30 Siren: large, electric motor driven. 3C20.40 Sprockets on shaft rotate against a card to make sound. 3C20.15 Galton's whistle: Compressed air whistle. 3C20.16 Limit of audibility: Set of rods that ring at different frequencies.
B+45+0 Steel spring pendulum, inverted, vibrates at 10 Hz. B+45+5 Giant tuning fork, barely audible, displayed with stroboscope. B+45+10 Ultrasound transducers (40 kHz) as both sources and receivers. B+45+15 Bell ringing in a jar evacuated with pump. B+45+20 Savart's wheel: Toothed wheel and cardboard or air jet. B+45+25 Siren: large, electric motor driven. B+45+32 Twirling Tube B+45+35 Sprockets on shaft rotate against a card to make sound. B+45+40 Caruga horn: Varigated tube to blow through B+45+42 Hoot Tube B+45+45 Galton's whistle: Compressed air whistle. B+45+50 Helmholtz resonators drive radiometer vanes, using tuning forks. B+45+55 Casio electronic synthesizer with amp and speaker. B+45+41 Feedback from microphone/speaker system. B+45+51 Helmholtz Resonators with tuning forks and a candle B+45+60 Applet: Vibrational Behavior of an Empty Beer Bottle B+45+65 Applet: Vibrational Modes of a Tuning Fork