Compressed air jet blows through spinning disk with holes.

3C20.30 • B+45+30

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.

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+41 Feedback from microphone/speaker system. 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+51 Helmholtz Resonators with tuning forks and a candle B+45+55 Casio electronic synthesizer with amp and speaker. B+45+60 Applet: Vibrational Behavior of an Empty Beer Bottle B+45+65 Applet: Vibrational Modes of a Tuning Fork

Compressed air jet blows through spinning disk with holes.

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