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a wave vibrating in the direction of propagation.

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the process by which a beam of light or other system of waves is spread out as a result of passing through a narrow aperture or across an edge, typically accompanied by interference between the wave forms produced.

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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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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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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 crest is the point on a wave with the maximum value or upward displacement within a cycle. A crest is a point on the wave where the displacement of the medium is at a maximum

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a comb or tuft of feathers, fur, or skin on the head of a bird or other animal.