Ultraviolet Light

By: Robert, Tony, Da'Quon, Jermaine

Description of a UV Light

The wavelength of a UV light is about 1.5x10^-5 in to 4x10^-7 in and the frequency is 8x10^14 Hz to 3x10^16 Hz. The velocity is measured to approximately 3x10^8 m/s. Scientists have divided the ultraviolet part of the spectrum into three regions, the near ultraviolet, the far ultraviolet, and the extreme ultraviolet. Ultraviolet light is a type of electromagnetic radiation.
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Everyday Applications

Three things that use UV light is light bulbs, tanning beds, and a machine used to make sure money isn't fake. UV light is also used in medicine to treat many skin diseases.

Health Impacts

Positive

  • Useful for disinfection– UV has positive applications in the fields of disinfection. UV can effectively kill microorganisms such as viruses and bacteria.
  • Triggers vitamin D – UV from the Sun is needed by our bodies to produce Vitamin D. (Vitamin D helps strengthen bones, muscles and the body’s immune system)
  • Helps some skin conditions – UV is used in the treatment of skin conditions such as psoriasis. UV light slows the growth of the skin cells and relieves the symptoms.
Robot uses ultraviolet light to increase patient safety

Summary

This video shows a 'TRU-D' a robot that disinfects that common microorganisms found in hospitals. It stops the bacteria from spreading or multiplying and it doesn't harm any patients. TRU-D calculates the size of the room with the amount of UV light needed to wash the room in UV light then shuts off. It helps hospitals solve the spread of bacteria and viruses from one patient to another.

Negative


  • Damages eyes – Long exposure to UV or high intensities of UV damages the tissues of eyes and can cause a burning of the eye surface.
  • Damages immune system – Over-exposure to UV radiation has a harmful suppressing effect on the immune system. Repeated over-exposure to UV radiation can cause even more damage to the body's immune system.
  • Ages skinUV speeds up the aging of skin, since the UV destroys tissue beneath the top layer of the skin. This causes wrinkles and brown liver spots.
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Effects of Ultraviolet Light on DNA (Article)

http://www.livestrong.com/article/88549-effects-ultraviolet-light-dna/


This article talked about the effects UV lights have on DNA and how it can cause mutations. UV light can chemically change your DNA since UV light is a type of radiation that alters a persons DNA code. This happens because DNA attracts UV light like a magnet considering that UV light meets the need of energy that DNA needs. Long exposure to UV light glitches the DNA by locking together to the incorrect strand and causes a bulge of DNA. Some bases of DNA can be taken out and replaced with a random strand. Finally every change in your DNA increases your chances of be diagnosed with skin cancer.