Acoustics and Vibration Animations
photo credit: Jim Krider, Physics Instructional Resource Team, Arizona State
In this classic physics demonstration, the tube that contains the Bunsen burner gas has a speaker at each end that emits a pure tone. The tones have the same frequency and are in phase. The frequency of the tones is selected to set up a large standing wave inside the tube, and the resulting pressure distribution produces the pattern of flames.
Click here for more on standing waves.
(This feature was updated on August 14, 2011.)
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Become a Master of Inertia
Find out how to do a less risky version of the pull-the-tablecloth-out-from-under-the-plates "magic trick." The version at this website, from the Ontario Science Center, is particularly interesting because instead of plates on a tablecloth, you'll use a pair of coins balanced on the rim of a glass. Try it! Also, you'll learn how the concept of inertia explains what happens.