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from The Physics Classroom Tutorial, at Glenbrook South High School in Glenview, IL.
http://www.glenbrook.k12.il.us/gbssci/phys/Class/waves/u10l1a.html
Originally written for high school physics students by Tom Henderson, science teacher at Glenbrook South High School. A good introduction to wavemotion with checking questions, animations, graphs, etc. to help the student understand wave motion.