- Faraday wave
Faraday waves, also known as Faraday ripples, are nonlinear
standing waves that appear on liquids enclosed by a vibrating receptacle. They are named after Michael Faraday, who first described them in an appendix to an article in the Philosophical Transactionsof the Royal Society of Londonin 1831.
If a layer of liquid is placed on top of a vertically oscillating piston, a pattern of
standing waves appears which oscillates at half the driving frequency. These waves can take the form of stripes, close-packed hexagons, or even squares or quasiperiodic patterns. Faraday waves are commonly observed as fine stripes on the surface of wine in a wineglass that is ringing like a bell. Faraday waves also explain the 'fountain' phenomenon on a singing bowl.
* [http://www.youtube.com/watch?v=nq3ZjY0Uf-g You Tube video of Faraday waves in corn starch.]
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