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The range of wavelengths or frequencies over which electromagnetic radiation extends.

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A wave of compression and rarefaction, by which sound is propagated in an elastic medium such as air.

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Wave speed is the speed at which a wave travels.

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The rate at which something occurs or is repeated over a particular period of time or in a given sample.

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The maximum extent of a vibration or oscillation, measured from the position of equilibrium.

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The distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.

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Move one's hand to and fro in greeting or as a signal.