1.http://www.nb2.go.th/~suwanpit/sc/e-leaning/wave/images/u12l1b1.gif
2.http://upload.wikimedia.org/wikipedia/commons/thumb/f/f5/Light_dispersion_conceptual_waves.gif/180px-Light_dispersion_conceptual_waves.gif
3.http://upload.wikimedia.org/wikipedia/commons/thumb/3/31/Processing_of_sound.jpg/300px-Processing_of_sound.jpg
4.http://blake.prohosting.com/pstutor/physics/wave/wave_concept.html
5.http://www.most.go.th/tsunami/images/stories/image002.jpg
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