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A crest is the point on a wave with the maximum value or upward displacement within a cycle

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

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

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

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A substance, such as agar, in which bacteria or other microorganisms are grown for scientific purposes

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Diffraction is defined as a process by which light waves break up into dark and light bands or into the colors of the spectrum

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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 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 wave vibrating in the direction of propagation.