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UV Light Waves

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Marali Harikar

on 4 March 2014

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Transcript of UV Light Waves

UV Light
Project BY:
There are three categories of UV radiation: UV-A, UV-B and UV-C. UV-A rays have a wavelength of 3.2 x 10 – 4.2 x 10 , UV-B rays have a wavelength of 2.8 x 10 – 3.2 x 10 , and UV-C rays have a wavelength of less than 1 x 10 – 2.8 x 10 . The frequency is

10and 10 .

SOURCE: http://enhs.umn.edu/current/5103/uv/character.html

Johann W. Ritter, it was discovered in 1801 when he was experimenting with silver chloride, a chemical which turned black when exposed to sunlight. He had heard that exposure to blue light caused a greater reaction in silver chloride than exposure to red light. Ritter decided to measure the rate at which silver chloride reacted when exposed to the different colors of light. To do this, he directed sunlight through a glass prism to create a spectrum. He then placed silver chloride in each color of the spectrum. Ritter noticed that the silver chloride showed little change in the red part of the spectrum, but increasingly darkened toward the violet end of the spectrum. This proved that exposure to blue light did cause silver chloride to turn black much more efficiently than exposure to red light.
http://coolcosmos.ipac.caltech.edu/cosmic_classroom/classroom_activities/ritter_bio.html Thank you for watching we hope you enjoyed our presentation
-Marali and Eleanor Characteristics of the UV light wave 15 17 FOUNDER: Johann W Ritter Uses for the ultra violet wave 1) Treats jaundice
2) Water purification
3) ultra violet blood irradiation
4) clean hospital blood for transfusions Source: www.ehow.com Jaundice Jaundice is a build up of yellow pigment which is called, bilirubin in the blood. It usually happens to newborns and it is treated by using the ultra violet light therapy which breaks down the excess bilirubin and brings the baby's color back to normal. How it works :

The baby is treated at the hospital, he will be placed by a nurse in an incubator that has attached to the top of it a set of special fluorescent white,blue light, or UV light, called bililights. The lights emit a limited range of ultraviolet light wavelights, that is safe for the newborn's skin.Treatment of infants with jaundice may require light therapy. The baby is placed under a light that emits blue to green spectrum rays. The blue light changes the shape and structure of the yellow bilirubin molecules, helping them leave the body.

Sources: http://www.livestrong.com/article/127829-blue-light-therapy-jaundice/#ixzz2ROtUhurE http://www.ehow.com/way_5694796_ultraviolet-light-therapy-jaundice.html Water Purification UV light is also used in water purification, sewage treatment and air ventilation systems in hospitals and office buildings amongst many other uses. Ultraviolet radiation can be used as a pre-treatment or polishing step to sterilize and disinfect water. UV systems are typically used to pre-treat a water supply that is considered biologically unsafe (lake or sea water, well water, etc). The UV disinfection process is a non-chemical method for destroying microorganisms by altering their genetic material, and rendering them unable to reproduce. Most UV systems have stainless steel reactors or reactor linings. Picture of the Andromeda galaxy with UV waves How it works:
Ultraviolet light kills microorganisms by damaging the DNA. UV radiation disrupts the chemical bonds that hold the atoms of DNA together in the microorganism. If the damage is severe enough, the bacteria cannot repair the damage and will die. Longer exposure to UV light is necessary to ensure complete kill-off of all microorganisms. Unlike chemical treatments, UV-treated air or water does not resist re-contamination.

Source: http://www.ehow.com/how-does_5188035_uv-light-kill-bacteria_.html#ixzz2ROp2kB7I References www.ehow.com http://enhs.umn.edu/current/5103/uv/character.html http://coolcosmos.ipac.caltech.edu/cosmic_classroom/classroom_activities/ritter_bio.html http://www.livestrong.com/article/127829-blue-light-therapy-jaundice/#ixzz2ROtUhurE

http://www.livestrong.com/article/127829-blue-light-therapy-jaundice/#ixzz2ROtUhurE http://www.ehow.com/how-does_5188035_uv-light-kill-bacteria_.html#ixzz2ROp2kB7I http://www.space.com/15590-andromeda-galaxy-m31.html -7 -7 -7 -7 -7 -7
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