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UV (Ultraviolet) Rays

UV (Ultraviolet) Rays

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UV (Ultraviolet) Rays

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  1. UV (Ultraviolet) Rays By Rachel Bass, Ian Lund, and Jackson Wells

  2. CLASSY FACTS ABOUT UV RAYS • UV Rays have wavelengths between 4x10-7 meters and 7x10-7 meters • UV Rays have a frequency between 1015 hertz and 1016 Hertz • UV Rays are between Visible Light and X-Rays on the Electromagnetic Spectrum

  3. THE CLASSY DISCOVERY OF UV RAYS • Johann Willhelm Ritter of Poland discovered UV Rays in 1801 • After hearing that when Silver Chloride is exposed to blue light there is a greater reaction than when it is exposed to red light, Ritter experimented with the substance by directing sunlight with a glass prism and created a spectrum reflecting on the Silver Chloride. • The substance was increasingly darker as it moved from the red light to the violet. This showed that violet light makes the Chloride turn black faster. • Out of curiosity, Ritter moved the Silver Chloride beyond the violet light and there was an “intense reaction” • From this he discovered this form of invisible light beyond the end of the spectrum that is now called UV Light.

  4. CLASSY USES FOR UV RAYS • Ultraviolet Rays come from the sun • There are 3 types of UV Rays • UV-A (the weakest waves that reach earth) • UV-B (only some of these waves reach earth) • UV-C (the strongest waves that never reach earth) • UV-C Rays can be man made and are used in hospitals to treat some skin disorders and kill germs on surgical tools • Scientists use UV Rays to discover what chemicals make up objects by observing the rays that the objects give off

  5. WHEN UV RAYS MEET SKIN • When UV Rays touch skin, people produce more Vitamin D • But too much sun is bad for you, and causes your skin to burn • The best way to protect yourself is to use sunscreen before going out, SPF 30 or above

  6. SKIN CANCER • With too much exposure to UV Rays, people can develop skin cancer • UV Rays give molecules so much energy that instead of making them shake like what is natural, they shake so much that they cause the molecules to split • This changes the chemical structure of the molecule • By doing this, living organisms can develop cell damage and deformities by mutating the genetic code

  7. EFFECTS ON LIVING ORGANISMS • Humans cannot see UV Rays • But other insects, like bees can • Bees use the UV Rays to see its reflection off flowers, to see where to get pollen

  8. The End

  9. BIBLIOGRAPHY • • • • "Ritter Discovers Ultraviolet Light." Web. 09 May 2010. • • • "Students Guide-Ultraviolet Radiation." Web. 09 May 2010. • "Ultraviolet Radiation." Britannica Online. Web. 10 May 2010. <http://>. • "Ultraviolet Radiation." Web. 10 May 2010. <http://>. • • "UV Rays." Vol. 11. Chicago: Scott Fetzer Company, 2006. 101. Print. • Viegas, Jennifer. The Role of the Sun in Our Solar System: an Anthology of Current Thought. New York: Rosen Pub. Group, 2006. Print.