photo credit: Andrew Davidhazy, Rochester Institute of Technology
In the photos above (hi-res version), the tension in the vibrating string is maintained by a weight at the bottom, and the top end of the string is vibrated. To find out more about how these photographs were created, visit String Vibrations, by Andrew Davidhazy.
Once you have clicked on the "simulation" link below, be sure to read the Java Security Advisory before running the simulation: To do that, click the "Read now" button on the yellow band near the top of the PhET page.
To learn about string vibrations, see the PhET simulation Waves on a String, from the University of Colorado. Also, you can visit Standing Waves, especially "Standing Waves 1 - On a String, Both Ends Fixed."
(This feature was updated on May 6, 2013.)
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If you'd like to do an interesting buoyancy activity, visit the Exploratorium's Descartes' Diver and build a Cartesian diver. For a simulation on floating and sinking, visit the SEED program's Buoyancy Explorer. To learn more about floating and sinking, see the Nova sites Buoyancy Basics and Buoyancy Brainteasers.