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A wave vibrating in the direction of propagation.

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he 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 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 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. While waves can move over long distances, the movement of the medium of transmission—the material—is limited. Therefore, the oscillating material does not move far from its initial equilibrium position.

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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 channel used to convey a liquid.

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1.The top of something, especially a mountain or hill.
2.A comb or tuft of feathers, fur, or skin on the head of a bird or other animal.