Bell ringing in a jar evacuated with pump.

3B30.30 • B+45+15

Bell ringing in a slowly evacuated (or aerated) chamber. The vacuum flask apparatus has a valve to either pump air out or let air in. The sound diminishes fairly rapidly as air is pumped out of the chamber.

Usage

Summer 2013 - Fall 2025

55 reservations across 8 classes

Related Demos

3B30.01 Ultrasound transducers (40 kHz) as both sources and receivers. 3B30.20 Measurement of speed of sound with microphone, speaker, oscilloscope. 3B30.50 Breathe helium, voice pitch rises; breathe SF6, voice pitch lowers.

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+20 Savart's wheel: Toothed wheel and cardboard or air jet. B+45+25 Siren: large, electric motor driven. B+45+30 Compressed air jet blows through spinning disk with holes. 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