Peel School Earth and Space Science

Topics: Ultraviolet, Sun, Sunlight Pages: 2 (515 words) Published: March 10, 2013
Unit 2 Activity 5 Salman Shaik

UV Radiation

The sun if one of the primary sources of Energy for the Earth, but it also emits many harmful rays towards us. Ultraviolet (UV) radiation is very similar to visible light, but the ultraviolet region starts right after the violet end, hence, ultra”violet” rays. The UV radiation from the sun can be very hazardous to humans and all other living organisms. High exposure to UV radiation can cause melanomas as the UV rays can affect living organism as the molecular level. It has a frequency of 10^(-8)

Just like most forms of electromagnetic radiations, the main source of natural ultraviolet radiation are the stars, including our sun. Most of the ultraviolet radiation that strikes the sun is form the sun. The action of ultraviolet rays on oxygen in our atmosphere creates layer about 9 to 19miles above sea level. This ozone layer absorbs almost all of the shorter waves of UV rays that enter the earths atmosphere, and prevents it from doing any severe damage on the living organisms on earth. The fast depleting ozone player is a rising concern.

UV radiation is known to be one of the leading causes of Skin cancer. UV rays from the sun and other sources such as tanning booths etc, can damage skin cells, causing cells to grow abnormally. Melanin is the pigment that gives skin its colour, and protects the skin from damage by sunlight. Light skinned people have skin cells called melanocytes that produce much less melanin, so they is less protection against harmful rays. Melanoma is more common in people who lives in areas with large amounts of US radiation. Tanning booths also release article UV lights which can also damage skin cells and cause melanoma. UV radiation can also be good since it provides VItamin D to the body. The next figures show how different wavelengths of sunlight can affect humans.



You can predict danger zones of where the UV radiation has...
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