Milla Jovovich
Violet
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Apr 3, 2024 · Ultraviolet radiation,that portion of the electromagnetic spectrum extending from the violet, or short-wavelength, end of the visible light range to the X-ray region. Its wavelengths are between 400 and 10 nanometers. Learn more about ultraviolet radiation.
- The Editors of Encyclopaedia Britannica
- What is ultraviolet radiation?Ultraviolet radiation is the portion of the electromagnetic spectrum extending from the violet, or short-wavelength, end of the visible light range...
- How is ultraviolet radiation produced?Ultraviolet radiation is produced by high-temperature surfaces, such as the Sun’s, in a continuous spectrum and by atomic excitation in a gaseous d...
- Can humans see ultraviolet radiation?No, ultraviolet radiation is undetectable by the human eye. Many insects, however, are able to see ultraviolet radiation.
- What is ultraviolet radiation used for?Ultraviolet radiation is useful as both a research tool and a sterilizing technique. It can also be used in fluorescent lamps, which are a more ene...
- Can ultraviolet radiation cause cancer?The three basic skin cancers, basal- and squamous-cell carcinoma and melanoma, have been linked to long-term exposure to ultraviolet radiation and...
Ultraviolet (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.
Mar 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.
- What is UV?Everyone is exposed to UV radiation from the sun and an increasing number of people are exposed to artificial sources used in industry, commerce an...
- Is there a connection between ozone depletion and UV radiation?Ozone is a particularly effective absorber of UV radiation. As the ozone layer gets thinner, the protective filter activity of the atmosphere is pr...
- Which environmental factors affect a person's UV exposure?Time of year and time of day UV levels vary mainly with the height of the sun in the sky and in mid-latitudes are highest during the summer months...
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Aug 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 LIGHT FROM OUR SUN.
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Ultraviolet radiation (UVR) can neither be seen nor felt. While some people are exposed to artificial UVR sources (e.g. in medicine, industry and for disinfection and cosmetic purposes), everyone is exposed to solar UVR. Solar UVR levels are influenced by several factors: 1. Sun elevation: the higher the sun in the sky, the higher the UVR level. UV...
Small amounts of UVR are beneficial to health and play an essential role in the production of vitamin D. However, excessive exposure to UVR is associated with negative health consequences as UVR is carcinogenic to humans.
Children and adolescents are particularly vulnerable to the harmful effects of UVR due to their skin and eye structure. Sunburns in childhood lead to a higher risk of skin cancer in later life. Also, a larger amount of UVR can reach and damage their retina. Fair-skinned people suffer more from sunburn and have a higher risk of skin cancer than dark...
Skin cancer is highly preventable. WHO recommends the following measures to protect against excessive exposure to UVR. 1. Limit time in the midday sun. 2. Seek shade. 3. Wear protective clothing. 4. Wear a broad brimmed hat to protect the eyes, face, ears and neck. 5. Wear wraparound-style sunglasses that provide 99 to 100% UV-A and UV-B protection...
WHO aims to reduce the burden of disease resulting from exposure to UVR. It encourages research, develops guidance and disseminates information tools about effective UVR protection interventions related to the public, occupationally exposed workers and patients. The Global Solar UV index (UVI), an information tool that describes the level of solar ...
Ultraviolet radiation lies between visible light and X-rays along the electromagnetic spectrum. UV "light" spans a range of wavelengths between about 10 and 400 nanometers. The wavelength of violet light is around 400 nanometers (or 4,000 Å). Ultraviolet radiation oscillates at rates between about 800 terahertz (THz or 10 12 hertz) and 30,000 THz.
What is ultraviolet radiation? Ultraviolet (UV) radiation is a form of energy that the sun produces. You can’t see UV radiation because its wavelengths are shorter than visible light. The UV energy that the sun produces reaches the Earth and provides vitamin D for your body to help you survive.
