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The distance light can travel in a unit of time through a given substance.Light travels through a vacuum at about 186,000 miles, or 300,000 kilometers, per second.

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One of the waves that are propagated by simultaneous periodic variations of electric and magnetic field intensity and that include radio waves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

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The entire range of electromagnetic radiation, which includes, in order of increasing frequency and decreasing wavelength, radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, x-rays, and gamma rays.

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Frequency is the number of occurrences of a repeating event per unit of time.

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an important parameter of waves and is the maximum displacement of points on a

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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.