Ultraviolet
Ultraviolet
Ultraviolet (pronounced: /ˌʌltrəˈvaɪəlɪt/) is a form of electromagnetic radiation with wavelength from 10 nm (with a corresponding frequency of approximately 30 PHz) to 400 nm (750 THz), shorter than that of visible light but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs and specialized lights, such as mercury-vapor lamps, tanning lamps, and black lights.
Etymology
The term "ultraviolet" means "beyond violet" (from Latin ultra, "beyond"), violet being the color of the shortest wavelengths of visible light.
Related Terms
- Electromagnetic spectrum: The range of all types of EM radiation. Radiation is energy that travels and spreads out as it goes – the visible light that comes from a lamp in your house and the radio waves that come from a radio station are two types of electromagnetic radiation.
- Visible light: The portion of the electromagnetic spectrum that is visible to the human eye.
- X-rays: A type of radiation called electromagnetic waves. X-ray waves are shorter than UV waves and can penetrate the body to form an image on film.
- Sunburn: A form of radiation burn that affects living tissue, such as skin, that results from an overexposure to ultraviolet (UV) radiation, commonly from the sun.
- Black light: A lamp that emits long-wave (UV-A) ultraviolet light and not much visible light.
External links
- Medical encyclopedia article on Ultraviolet
- Wikipedia's article - Ultraviolet
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