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Microwaves

Microwaves. By Radha Sharma, Alison Valley and Elizabeth Shenson. Microwaves. Range of wavelengths: 1m-1mm Range of frequency: 300MHz - 300GHz Between radio waves and infared waves in Electromagnetic Spectrum. Uses of Microwaves. Communications

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Microwaves

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  1. Microwaves By Radha Sharma, Alison Valley and Elizabeth Shenson

  2. Microwaves • Range of wavelengths: 1m-1mm • Range of frequency: 300MHz - 300GHz • Between radio waves and infared waves in Electromagnetic Spectrum

  3. Uses of Microwaves • Communications • Microwaves were used because their long wavelengths allowed them to travel far while being accurate to their location.

  4. Radar • Microwaves can detect the speed and range of remote objects • Air traffic control, automatic doors and weather forecasting find microwave radar useful.

  5. Microwave ovens • These types of ovens send microwave radiation waves though food causing it to heat up. • Microwave ovens heat up everyday food making cooking much easier.

  6. WiFi connection • At a low intensity, the high frequency of microwaves allows the connection to travel to far places and create internet sources.

  7. Government communication • Government officials rely on microwaves high frequency to communicate through long distance phone calls.

  8. Are radio waves damaging to humans? • Low energy can cause severe burning • Can heat human body organs; may cause damage is body is unable to dissipate heat • Can cause hearing sensations • Research is being done to see if the waves cause harm to the immune system and central nervous system.

  9. Who? Heinrich Rudolf Hertz, a German physicist, is responsible for the proving and demonstrating the existence of microwaves in 1886

  10. How were microwaves discovered? • In 1865, a British mathematician named James Clerk Maxwell theorized the existence of electromagnetic by means of equations • Assuming that Maxwell’s ideas were correct, Hertz carried out an experiment to produce these waves

  11. The Experiment • The experiment consisted of an oscillator made of brass knobs that were connected to an to an in induction coil and separated by a gap, over which sparks could jump

  12. When the sparks appeared on the receiver, it was clear that electromagnetic waves were being transmitted

  13. Interesting Facts • The SETI (Search For Extraterrestrial Intelligence) uses microwaves to search for aliens • Since microwaves do not occur in nature, any evidence of them could mean extraterrestrial life

  14. Bibliography • "Animal Senses: Sight Smell Taste and Touch as Well as Other Senses." Saltwater Fish. Web. 13 May 2010. <http://fishinsects.suite101.com/article.cfm/animal_senses>.  • The Electromagnetic Spectrum. Photograph. Web.  • "The Electromagnetic Spectrum Tutorial." Http://www.klimaforschung.net. Web. <http://www.klimaforschung.net/electromagneticspectrum%5B1%5D.swf>.  • "The Electromagnetic Spectrum Tutorial." Http://www.klimaforschung.net. Web. <http://www.klimaforschung.net/electromagneticspectrum%5B1%5D.swf>.  • "File:Heinrich Rudolf Hertz.jpg." Wikipedia, the Free Encyclopedia. Web. 14 May 2010. <http://en.wikipedia.org/wiki/File:Heinrich_Rudolf_Hertz.jpg>.  • "Heinrich Hertz: The Discovery of Radio Waves." The Orchid Grower: A Juvenile Science Adventure Novel. Web. 14 May 2010. <http://www.juliantrubin.com/bigten/hertzexperiment.html>.  • "Heinrich Rudolph Hertz." Corrosion Science and Engineering Information Hub. Web. 14 May 2010. <http://corrosion-doctors.org/Biographies/HertzBio.htm>.  • "Inventor Heinrich Hertz." The Great Idea Finder - Celebrating the Spirit of Innovation. Web. 14 May 2010. <http://www.ideafinder.com/history/inventors/hertz.htm>.  • "Microwave Health Effects." NEWTON/ANL Home Page. Web. 14 May 2010. <http://www.newton.dep.anl.gov/askasci/gen99/gen99445.htm>.  • "Microwave." Wikipedia, the Free Encyclopedia. Web. 13 May 2010. <http://en.wikipedia.org/wiki/Microwave>.  • "Microwaves." NASA Science. Web. 14 May 2010. <http://science.hq.nasa.gov/kids/imagers/ems/micro.html>.  • "WikiAnswers - How Are Electromagnetic Waves Harmful to Humans." WikiAnswers - The Q&A Wiki. Web. 14 May 2010. <http://wiki.answers.com/Q/How_are_electromagnetic_waves_harmful_to_humans>. 

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