Ultraviolet - Wikipedia
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. It is also produced by electric arcs, Cherenkov radiation, and ...
Ultraviolet radiation | Definition, Examples, Effects, Wavelengths ...
2024年9月23日 · 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. Ultraviolet (UV) radiation is undetectable by the human eye , although, when it falls on certain materials, it may cause them to fluoresce —i.e., emit electromagnetic radiation ...
Ultraviolet radiation - World Health Organization (WHO)
2022年6月21日 · 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 …
Ultraviolet Waves - Science@NASA
2016年8月10日 · 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.
紫外线（频率介于可见光和X射线之间的电磁波）_百度百科
紫外线（Ultraviolet，UV）是 电磁波谱 中频率为750THz～30PHz，对应真空中波长为400nm～10nm辐射的总称，不能引起人们的视觉。 它是 频率比 蓝紫光高的 不可见光。 紫外线的英文名是Ultraviolet，其中的ultra–意为“高于，超越”。 1801年，德国物理学家 里特 发现：在日光光谱的紫端外侧一段能够使含有 溴化银 的 照相底片 感光，从而发现了紫外线的存在。 紫外线可以用来灭菌。 不过，过多的紫外线进入人体内会导致 皮肤癌。 中文名. 紫外线. 外文名. …
Ultraviolet (UV) Radiation: What It Is & Its Effect on Your Skin
2022年11月16日 · Overview. 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. Advertisement. Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission.
What is UV radiation and how does it affect health? - Medical News Today
2023年8月24日 · Ultraviolet (UV) radiation is one part of the electromagnetic spectrum of radiation that reaches Earth from the sun. It is a form of light energy situated on the spectrum just beyond visible...
Facts About Ultraviolet Radiation | Radiation and Your Health
2024年2月20日 · Ultraviolet (UV) radiation is a form of non-ionizing radiation that is emitted by the sun and artificial sources. The beneficial effects of UV radiation include the production of a vital nutrient, vitamin D. However, overexposure may present risks. Sunburn, premature aging, and skin cancer are all risks to overexposure.
Radiation: Ultraviolet (UV) radiation - World Health Organization …
The sun is by far the strongest source of ultraviolet radiation in our environment. Solar emissions include visible light, heat and ultraviolet (UV) radiation. Just as visible light consists of different colours that become apparent in a rainbow, the UV radiation spectrum is divided into three regions called UVA, UVB and UVC.
Ultraviolet Light or UV Radiation - Science Notes and Projects
2023年4月1日 · Ultraviolet light or UV is electromagnetic radiation in the wavelength range of 10 to 400 nanometers (nm), which is between x-rays and visible light. Because it is largely invisible to humans, another name for UV is black light .