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a wave vibrating in the direction of propagation.

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the throwing back by a body or surface of light, heat, or sound without absorbing it

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Diffraction is the bending of waves around obstacles and openings.

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Medium wave (MW) is the part of the medium frequency (MF) radio band used mainly for AM radio broadcasting.

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A transverse wave is a moving wave that consists of oscillations occurring perpendicular (right angled) to the direction of energy transfer (or the propagation of the wave).

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the fact or phenomenon of light, radio waves, etc., being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density.

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A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium.

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an oscillation of the parts of a fluid or an elastic solid whose equilibrium has been disturbed, or of an electromagnetic wave.

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A trough is the opposite of a crest, so the minimum or lowest point in a cycle.

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A crest is the highest point the medium rises to and a trough is the lowest point the medium sinks to.