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A wave is an oscillation accompanied by a transfer of energy.

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The wavelength of a sinusoidal wave is the spatial period of the wave—the distance over which the wave's shape repeats, and thus the inverse of the spatial frequency.

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The maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position

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The number of crests of a wave that move past a given point in a given unit of time.

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Wave speed is the speed at which a wave travels.

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