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TeachMeFinance.com - explain Ultraviolet Ultraviolet -- Electromagnetic radiation in the wavelength range of 4 to 400 nanometers. another definition... Ultraviolet -- (UV) electromagnetic radiation resembling visible light, but of shorter wavelength. The eye cannot see UV, and much of it is absorbed by ozone, a variant of oxygen, at altitudes of 30-40 km; satellite telescope, however, can and do view stars and the Sun in UV, and even in the extreme UV (EUV), the range between UV and X-rays. another definition... ultraviolet -- Light that is so blue humans cannot see it. A band of the electromagnetic spectrum between the visible and the X-ray. Photons of ultraviolet light are more energetic than photons of visible light. Copyright © 2005 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.