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A wave vibrating in the direction of propagation.

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Change in direction of propagation of any wave as a result of its traveling at different speeds at different points along the wave front.

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

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he 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.

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

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