https://physlab-wiki.com/ 2026-04-26T17:35:33+00:00 https://physlab-wiki.com/ https://physlab-wiki.com/lib/tpl/UChicago/images/favicon.ico text/html 2021-09-27T11:14:29+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/waves_and_optics/instruments/breaking_a_beaker_with_sound?rev=1632755669&do=diff Breaking a Beaker with Sound A sine generator is used in conjunction with an audio amplifier and a horn loudspeaker to generate a powerful, single frequency tone. The sound waves will cause a common Pyrex beaker to vibrate. If the frequency of the generated tone matches the dominant resonant frequency of the beaker and the sound waves are strong enough, the beaker will break. text/html 2025-06-02T11:21:31+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/waves_and_optics/instruments/breaking_a_wine_glass_with_sound?rev=1748877691&do=diff Breaking a Wine Glass with Sound—Apparatus Under Construction Setup * Clamp glass by its neck using the clamp inside the GlassBuster, positioning the bell between the two speakers * approximate resonant frequency using a FFT app in your phone text/html 2023-03-23T13:22:16+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/waves_and_optics/instruments/chladni_plate?rev=1679592136&do=diff Chladni Plate Using a sine generator and mechanical driver a simple metal plate is made to resonate. Sand sprinkled on the plate will come to rest on the nodes, making the resonant mode clearly visible. Several distinct resonant modes may be found by sweeping the frequency of the sine generator. Square, circular, and triangular plates are available. text/html 2023-03-23T13:27:40+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/waves_and_optics/instruments/kundts_tube?rev=1679592460&do=diff Kundt's Tube Standing waves generated in the air inside a horizontal glass tube are made visible in the patterns formed in cork dust at the bottom of the tube. An aluminum rod with a disk attached is placed inside the tube and clamped at its midpoint. When the rod is rubbed correctly resonant vibrations in the rod couple to the volume of air inside the tube via the disk. text/html 2021-09-27T11:23:02+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/waves_and_optics/instruments/organ_pipes?rev=1632756182&do=diff Organ Pipes Organ pipes of different lengths are available to show how sound may be generated in a resonant cavity. One may also show that the pitch of tones generated depends on whether the pipe end is closed or open. Compressed air is available in the lecture halls to drive the pipes. text/html 2023-03-23T13:31:48+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/waves_and_optics/instruments/rubens_tube?rev=1679592708&do=diff Rubens Tube Natural gas is flowed into a copper pipe with a series of equally spaced holes. The gas flowing out of the holes may be lit and the height of the resulting flames is an indication of pressure in the pipe at that location. Sound waves are generated inside the pipe using a sine generator and a speaker mounted at one end. When the sine generator is tuned to a resonant frequency of the pipe, standing waves form and are observed in the flame pattern. text/html 2021-09-27T11:40:20+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/waves_and_optics/instruments/singing_corrugated_tube?rev=1632757220&do=diff Singing Corrugated Tube Tones are heard when a plastic corrugated tube is swung around in the air. Several harmonics may be generated by varying the speed with which the tube is swung. L2 PIRA DCS 3D30.35 text/html 2021-09-27T11:42:59+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/waves_and_optics/instruments/singing_rod?rev=1632757379&do=diff Singing Rod An aluminum rod is driven into audible resonance with a single stroke of the fingers. Holding the rod at different fractions of its length allows harmonic frequencies to be heard. Rosin is used to increase friction between the rod and fingers. text/html 2021-09-27T11:43:44+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/waves_and_optics/instruments/sonometer_with_suspended_weights?rev=1632757424&do=diff Sonometer with Suspended Weights Two metallic strings with different mass densities are stretched across a pair of bridges on a cavity resonator. One end of each string is attached to a weight pan and hung over a pulley to provide an adjustable and known tension to the string. Mersenne's laws may be demonstrated by observing the change in frequency as a function of tension, string length, and density.