wave - A disturbance that transfers energy., mechanical - The type of wave requires a medium to travel., longitudinal - This type of wave travels in the same direction as that of the disturbance., electromagnetic - This type of wave travels through empty space., transverse - This type of wave travels at a right angle, or perpendicular to the disturbance., medium - The matter that a wave moves through., trough - The lowest point of a transverse wave., sound - This wave is an example of a longitudinal wave., wavelength - The distance between two consecutive parts of a wave. (e.g. crest to crest or compression to compression), compression - An area of bunched up particles in a longitudinal wave., crest - The highest point or peak of a transverse wave., refraction - When a beam of light enters transparent glass, plastic, or water and changes direction or bends..”, reflection - When all of the waves of a beam bounce back when it hits a surface., visible - This type of light represents the wavelengths that are visible to most human eyes., diffraction - The process by which a beam of light or other system of waves is scatter as a result of passing through a small opening., transparent - Materials that allow light to pass through them and allow the image formation., rarefaction - An area of spread out particles of a longitudinal wave., translucent - Materials that allow light to pass through them, but light photons are scattered., opaque - Something that allows no light through it.,

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