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http://en.wikipedia.org/wiki/Wave
http://engineers4world.blogspot.in/2009/10/properties-and-characteristic...
http://www.britannica.com/EBchecked/topic/340440/light/258397/Characteri...
http://theory.uwinnipeg.ca/mod_tech/node120.html
http://theory.uwinnipeg.ca/physics/light/node3.html
http://www.aplusphysics.com/courses/regents/waves/regents_wave_character...
http://ibguides.com/physics/notes/wave-characteristics
http://www.physicsclassroom.com/class/waves/Lesson-2/The-Anatomy-of-a-Wave
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