Ultraviolet - Wikipedia
Ultraviolet radiation, also known as simply UV, 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 …
Ultraviolet radiation | Definition, Examples, Effects, Wavelengths ...
2024年11月11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 (UV) Radiation - Center for Science Education
Ultraviolet (UV) "light" is a type of electromagnetic radiation. UV light has a shorter wavelength than visible light. Purple and violet light have shorter wavelengths than other colors of light, and ultraviolet has even shorter waves than violet does; so ultraviolet is sort of "purpler-than-purple" light or "beyond violet" light.
Ultraviolet Waves - Science@NASA
2016年8月10日 · NASA's SDO spacecraft captured the image below in multiple wavelengths of extreme ultraviolet (EUV) radiation. The false-color composite reveals different gas temperatures. Reds are relatively cool (about 60,000 Celsius) while blues and greens are hotter (greater than one million Celsius).
Visible Light Spectrum Wavelengths and Colors - Science …
2021年1月16日 · Ultraviolet light and x-rays are the ionizing radiation beyond violet, while wavelength on the other side of red are infrared, microwaves, and radio waves. Isaac Newton coined the word spectrum in 1671 in his book Opticks.
UV Light - Stanford Solar Center - Stanford University
What is Ultraviolet Light? UV (Ultraviolet) Light refers to the region of the electromagnetic spectrum between visible light and X-rays, with a wavelength falling between 400 and 10 nanometers. This electromagnetic radiation is not visible to the human eye, because it has a shorter wavelength and higher frequency than the light our brain ...
What Is Ultraviolet Light? - Live Science
2017年9月15日 · Ultraviolet light is a type of electromagnetic radiation that makes black-light posters glow, and is responsible for summer tans — and sunburns. However, too much exposure to UV radiation is ...
Ultraviolet - New World Encyclopedia
Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than soft X-rays. The name means "beyond violet"— ultra is the Latin word for "beyond", and violet is the color of the shortest wavelengths of visible light.
Ultraviolet Light or UV Radiation - Science Notes and Projects
2023年4月1日 · Ultraviolet light falls into three categories based on wavelength, according to ISO standard 21348: UVA (315-400 nm): Long-wave ultraviolet light, which into the skin and is responsible for skin aging and DNA damage. UVB (280-315 nm): Medium-wave ultraviolet light, which can cause sunburns and skin cancer.
Ultraviolet radiation - Encyclopedia Britannica
2024年10月24日 · Ultraviolet radiation is detected by photographic plates and by means of the photoelectric effect in photomultiplier tubes. Also, ultraviolet radiation can be converted to visible light by fluorescence before detection. The relatively high energy of ultraviolet light gives rise to certain photochemical reactions. This characteristic is ...