Sound Waves: Longitudinal Wave, Compressional Wave, Only travels through a medium , Mechanical wave, Created by vibrations, Travels most quickly through solids, Light Waves: Electromagnetic waves ( Electrical field ✚magnetic field), Travels through empty space; no medium needed, Transverse waves, Not created by vibrations, Can not travel through opaque substances, Photons / Wave, Waves: Observe with your senses, Form of ENERGY,

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