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a wave vibrating in the direction of propagation.

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

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Diffraction refers to various phenomena that occur when a wave encounters an obstacle or a slit

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the intervening substance through which impressions are conveyed to the senses or a force acts on objects at a distance.

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a wave vibrating at right angles to the direction of its propagation.

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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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the oscillating, reciprocating, or other periodic motion of a rigid or elastic body or medium forced from a position or state of equilibrium.

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a long, narrow open container for animals to eat or drink out of.

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Waves have moving crests (or peaks) and troughs. A crest is the highest point the medium rises to and a trough is the lowest point the medium sinks to