Ultraviolet radiation | Definition, Examples, Effects, Wavelengths ...
WEBSep 23, 2024 · Ultraviolet radiation lies between wavelengths of about 400 nanometres (1 nanometre [nm] is 10 −9 metre) on the visible-light side and about 10 nm on the X-ray side, though some authorities extend the short-wavelength limit to 4 nm.
Ultraviolet Waves - Science@NASA
WEBAug 10, 2016 · Ultraviolet (UV) light has shorter wavelengths than visible light. Although UV waves are invisible to the human eye, some insects, such as bumblebees, can see them. This is similar to how a dog can hear the sound of a whistle just outside the hearing range of humans.
Ultraviolet - Wikipedia
WEBUltraviolet (UV) light is electromagnetic radiation of wavelengths of 10–400 nanometers, 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.
Radiation: Ultraviolet (UV) radiation - World Health Organization …
WEBMar 9, 2016 · The UV region covers the wavelength range 100-400 nm and is divided into three bands: UVA (315-400 nm) UVB (280-315 nm) UVC (100-280 nm). Short-wavelength UVC is the most damaging type of UV radiation. However, it is completely filtered by the atmosphere and does not reach the earth's surface.
Facts About Ultraviolet Radiation | Radiation and Your Health
WEBFeb 20, 2024 · UV radiation is classified into one of three primary groups: ultraviolet A (UVA), ultraviolet B, (UVB) and ultraviolet C (UVC). This grouping is based on the measure of their wavelength, which is measured in nanometers (nm= 0.000000001 meters or 1×10 …
Ultraviolet radiation - World Health Organization (WHO)
WEBJun 21, 2022 · Ultraviolet radiation. 21 June 2022. Key facts. Skin cancers are caused primarily by exposure to ultraviolet radiation (UVR), either from the sun or from artificial sources such as sunbeds. Globally in 2020, over 1.5 million cases of skin cancers were diagnosed and over 120 000 skin cancer-associated deaths were reported.
Ultraviolet (UV) Radiation - Center for Science Education
WEBAlmost all of the ultraviolet radiation that makes it through our atmosphere to Earth's surface is UV-A. UV-B waves, with wavelengths between 280 and 320 nm, carry more energy than UV-A waves. UV-B radiation is the main cause of sunburn; the SPF factor listed on sunscreens refers to their ability to reduce the effects of UV-B.
Ultraviolet Radiation: How It Affects Life on Earth
WEBUltraviolet (UV) radiation that reaches the Earth’s surface is in wavelengths between 290 and 400 nm (nanometers, or billionths of a meter). This is shorter than wavelengths of visible light, which are 400 to 700 nm.
Ultraviolet Radiation | Radiation and Your Health | CDC
WEBFeb 15, 2024 · UV radiation is classified into three primary types: ultraviolet A (UVA), ultraviolet B (UVB), and ultraviolet C (UVC), based on their wavelengths. Almost all the UV radiation that reaches earth is UVA though some UVB radiation reaches earth.
Electromagnetic radiation - UV, Wavelengths, Absorption
WEBSep 13, 2024 · All high-frequency electromagnetic radiation beyond the visible—i.e., ultraviolet light, X-rays, and gamma rays—is ionizing and therefore harmful to body tissues, living cells, and DNA (deoxyribonucleic acid).