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Definition: Invisible rays of energy emitted from the sun that cause sunburn, the greenhouse effect and cancer. |
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Ultraviolet light or UV light, although bad in some cases may be slightley healthy. a small dose of uv radiation gives your body vitamen D, needed for a healthy human. Without "D" You could grow weaker, have frail bones or have malnutrition as an effect of lack of "D". The wavelength of UV light is shorter than normal light. Thats why humans cannot naturally see it with the naked eye. Uv is transferred from the sun in radiation and results in sunburn.
Ultraviolet light can be lightened in its hurtful ways by applying sunscreen, a UV protective sunshirt, shade... or being a nerd and staying inside all day.
Another cool thing UV light can do is that on popular credit cards (Visa) when shown under a UV emitting Light, A small eagle will appear and confirm the credit cards legitimacy.
Only Bees can see UV light with their naked (ha) eye. This is because Bees have unique lenses in their eyes that filter certain kinds of light (Infared). If Humans could see UV, we could tell where it is stronger or weaker, allowing avoidance of possible sunburn. UV light can also cause a lot of damage to Paint, Rubber, Resin, Plastic, Skin, Retinas, and alluminum. That could be the reason that your dads car turns pale if its left outside to long. If it is, Get it fixed, ill wait.
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The sun's UV rays veiwed with a special camera |
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Uv light is a main cause in global climate change and the healthcare system. without it, dermatologists could lose 3/4 of their patients to skin cancer, the earth would cool, and there wouldnt be any "bee purple" (invisible uv rays only bees can see in the color purple).
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Hockberger, P. E. (2002), "A history of ultraviolet photobiology for humans, animals and microorganismsHockberger, P. E. (2002), "A history of ultraviolet photobiology for humans, animals and microorganisms
Wikipedia, "Ultraviolet." Wikipedia. 5/7/08. Wikipedia. 9 May 2008 http://en.wikipedia.org/wiki/Ultraviolet#References
Allen, Jeannie (2001-09-06), Ultraviolet Radiation: How it Affects Life on Earth, Earth Observatory, NASA, USA, <http://earthobservatory.nasa.gov/Library/UVB/> |
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