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Ultraviolet Radiation

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Reagan Rose

on 7 May 2010

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Transcript of Ultraviolet Radiation

Ultraviolet Radiation UV-A UV-B Ultraviolet (UV) radiation is defined as that portion of the electromagnetic spectrum between x rays and visible light Wavelength: 320-400 nano meters
Frequency = 750,000 hZ 937,500 Hz Wavelength: 280-320 nano meters
Frequency = 937,500 Hz - 1,071,429 Hz UV-C Wavelength: 200-280 nano metersFrequency = 1,071,429 Hz – 1,500,000 Hz UV-B Light:

is typically the most destructive form of UV radiation.
is needed by humans for synthesis of vitamin D.
can have harmful effects including erythema (sunburn), cataracts, and development of skin cancer. UV-C Light:

is the strongest and potentially most harmful form.
is almost never observed in nature because it is absorbed completely in the atmosphere. UV-A Light:

is the most commonly encountered type of UV light.
has an initial pigment-darkening effect (tanning).
is needed by humans for synthesis of vitamin D.
is often called black light. How It's Made The sun is a major source of ultraviolet rays.
UV rays can be made artificially by passing an electric current through a gas or vapor, such as mercury vapor. How It Was Discovered UV radiation was discovered by Johann W. Ritter. In 1801 Ritter conducted experiments with silver chloride and a prism. The National Weather Service's daily UV index predicts how long it would take a light-skinned American to get a sunburn if exposed, unprotected, to the noonday sun, given the geographical location and the local weather. It ranges from 1 (about 60 minutes before the skin will burn) to a high of 10 (about 10 minutes before the skin will burn). UV INDEX INTERESTING FACTS Ultraviolet (UV) light has shorter wavelengths than visible light. Though these waves are invisible to the human eye, some insects, like bumblebees, can see them! The reflection of UV rays off wings help insects identify mates. UV STUDIES There are many different satellites that help us study ultraviolet astronomy. Many of them only detect a small portion of UV light. For example, the Hubble Space Telescope observes stars and galaxies mostly in near ultraviolet light. NASA's Extreme Ultraviolet Explorer satellite is currently exploring the extreme ultraviolet universe. The International Ultraviolet Explorer (IUE) satellite has observed in the far and near ultraviolet regions for over 17 years. UV USES Medical Industrial/Commercial HEALTH EFFECTS Glue curing
Cleaning water
Fire detection
Can help treat symptoms of psoriasis and vitiligo
Air purification
Aging of the skin
Eye cataracts
Immune Supression
Cloud Cover
Ground reflection UV TATTOOS ReferencesPreventing Cancer - Ultraviolet Radiation. (n.d.). Retrieved April 21, 2010,
from http://www.virtualcancercentre.com/healthandlifestyle.asp?sid=4
Ultraviolet Radiation. (n.d.). Retrieved April 21, 2010, from St. Mary's Alumni Association website:
http://www.stmary.ws/highschool/Physics/uv_1.htm Ultraviolet Radiation. (n.d.).
National Science Foundation Polar Programs UV Monitoring Network.
Retrieved April 20, 2010, from http://www.biospherical.com/nsf/
Willett, E. (2005). The Ultraviolet Catastrophe.In The Basics Of Quantum Physics (pp. 20-23).
New York, New York: The Rosen Publishing Group, Inc. SOURCES
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