Ultraviolet
hideUltraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than x-rays, in the range 10 nm to 400 nm, and energies from 3 eV to 124 eV. It is so named because the spectrum consists of electromagnetic waves with frequencies higher than those that humans identify as the color violet.
UV light is found in sunlight and is emitted by electric arcs and specialized lights such as black lights. As an ionizing radiation it can cause chemical reactions, and causes many substances to glow or fluoresce. Most people are aware of the effects of UV through the painful condition of sunburn, but the UV spectrum has many other effects, both beneficial and damaging, on human health.
For more information about Ultraviolet, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
News tagged with ultraviolet light
When particles are so small that they seep right through skin
Nanotechnology / Bio & Medicine
Sep 30, 2008 |
4 / 5 (47) |
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Scientists are finding that particles that are barely there – tiny objects known as nanoparticles that have found a home in electronics, food containers, sunscreens, and a variety of applications – can breech our most personal ...
Memory, depression, insomnia -- and worms?
Biology /
Aug 05, 2008 |
3.9 / 5 (25) |
0
Researchers have spent decades probing the causes of depression, schizophrenia and insomnia in humans. But a new study may have uncovered key insights into the origins of these and other conditions by examining a most unlikely ...
Does too much sun cause melanoma?
Jul 23, 2008 |
4.2 / 5 (20) |
1
We are continuously bombarded with messages about the dangers of too much sun and the increased risk of melanoma (the less common and deadliest form of skin cancer), but are these dangers real, or is staying out of the sun ...
Presto! Fast color-changing material may lead to more powerful computers (w/Video)
Apr 23, 2009 |
4.5 / 5 (17) |
7
(PhysOrg.com) -- Researchers in Japan are reporting development of a new so-called "photochromic" material that changes color thousands of times faster than conventional materials when exposed to light.
Massive Stars Near the Galactic Center
Aug 28, 2009 |
4.3 / 5 (14) |
7
The Central Molecular Zone (CMZ) of our galaxy is a giant complex of molecular gas and dust situated in the innermost 700 light-years of the Milky Way. Although the galaxy is over 100,000 light-years in size, ...
Nuclear fusion research key to advancing computer chips
Aug 18, 2009 |
4.6 / 5 (10) |
5
(PhysOrg.com) -- Researchers are adapting the same methods used in fusion-energy research to create extremely thin plasma beams for a new class of "nanolithography" required to make future computer chips.
Pillars of Creation formed in the shadows
Apr 23, 2009 |
4.7 / 5 (9) |
0
Research by astronomers at the Dublin Institute of Advanced Studies suggests that shadows hold the key to how giant star-forming structures like the famous "Pillars of Creation" take shape.
New Laser Technique Advances Nanofabrication Process
Apr 09, 2009 |
3.8 / 5 (10) |
2
(PhysOrg.com) -- The ability to create tiny patterns is essential to the fabrication of computer chips and many other current and potential applications of nanotechnology. Yet, creating ever smaller features, ...
Scientists discovers 'firework' display in Helix Nebula
Jul 20, 2009 |
4.8 / 5 (8) |
2
(PhysOrg.com) -- A star does not die without getting noticed and may even leave the universe with "fireworks." At the end of its life cycle, a star begins to collapse in the middle and throws new material ...
Bright White Light Coaxed from Unexpected Source
Dec 18, 2008 |
4.7 / 5 (7) |
6
(PhysOrg.com) -- Duke University and United States Army scientists have found that a cheap and nontoxic sunburn and diaper rash preventative can be made to produce brilliant light best suited to the human ...
New on-off 'switch' triggers and reverses paralysis in animals with a beam of light (w/ Video)
Nov 18, 2009 |
4.8 / 5 (5) |
4
In an advance with overtones of Star Trek phasers and other sci-fi ray guns, scientists in Canada are reporting development of an internal on-off "switch" that paralyzes animals when exposed to a beam of ultraviolet ...
SKorean experts claim to have cloned glowing dogs
Apr 28, 2009 |
4 / 5 (4) |
1
(AP) -- South Korean scientists say they have engineered four beagles that glow red using cloning techniques that could help develop cures for human diseases. The four dogs, all named "Ruppy" - a combination ...
Bananas Gone Bad Glow Blue in UV-Light
Sep 09, 2009 |
4 / 5 (4) |
1
(PhysOrg.com) -- Nicholas Turro of Columbia University, Bernhard Krautler of the University of Innsbruck, Austria and their colleagues have found that, as chlorophyll ages and begins to disintegrate in banana ...
Scientists Shed 'Light' on Semiconductor Quandry
Jul 14, 2009 |
4.3 / 5 (3) |
2
(PhysOrg.com) -- UC San Diego scientists are using laser plasma-produced light sources to explore performance improvements of critical inspection tools for the semiconductor industry, which ultimately will ...
New nanostructure technology provides advances in eyeglass, solar energy performance
Nanotechnology / Nanomaterials
Sep 16, 2009 |
4 / 5 (3) |
1
(PhysOrg.com) -- Chemical engineers at Oregon State University have invented a new technology to deposit "nanostructure films" on various surfaces, which may first find use as coatings for eyeglasses that ...
