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Generally, electromagnetic radiation is classified by wavelength into radio wave, microwave, terahertz (or sub-millimeter) radiation, infrared, the visible region that is perceived as light, ultraviolet, X-rays and gamma rays.

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the women's section of the US Naval Reserve, established in 1942, or, since 1948, of the US Navy.

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The wavelength is the distance from crest to crest (or from trough to trough) (or between any two corresponding points on adjacent waves).

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

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Wavelength is also measured in metres (m) - it is a length after all. The frequency, f, of a wave is the number of waves passing a point in a certain time

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Wave speed is the speed at which a wave travels.Wave speed is related to wavelength, frequency, and period by the equation wave speed = frequency x wavelength

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