Ultraviolet

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Ultraviolet

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ultraviolet (uv): The portion of the electromagnetic spectrum in which the longest wavelength is just below the visible spectrum , extending from approximately 4 nm to approximately 400 nm. Note: Some authorities place the lower limit of uv at values between 1 and 40 nm, 1 nm being the upper wavelength limit of x-rays. The 400-nm limit is the lowest visible wavelength, i.e., the highest visible frequency , violet.

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