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I like the water/ripple ananology for just starting out with the physics of waves. it's a good visual. A subtle but definite difference. At first I wanted to argue your point but I found you to be right :-) I came across this good visual resource for the physics behind waves. http://www.physicsclassroom.com/Class/waves/U10L1a.html On 3/8/06, Neil Williams <linux@xxxxxxxxxxxxxx> wrote: > On Wednesday 08 March 2006 8:51 pm, John Botwright wrote: > > A good analogy is ripples on water. The water may be stationary, but the > > ripples are travelling. > > ?? The water is moving vertically. Only when it gets into shallow water does > the wave cause lateral movement, and that's only due to gravity. Don't > confuse waves with tides. > > The "movement" of the ripple is an illusion arising from surface tension. > > -- > > Neil Williams > ============= > http://www.data-freedom.org/ > http://www.nosoftwarepatents.com/ > http://www.linux.codehelp.co.uk/ > > > -- The Mailing List for the Devon & Cornwall LUG Mail majordomo@xxxxxxxxxxxxx with "unsubscribe list" in the message body to unsubscribe. FAQ: www.dcglug.org.uk/linux_adm/list-faq.html