David


 * Resources **

"The Electromagnetic Spectrum: FRONTLINE." Teachers' Domain. 20 Feb. 2004. Web. 25 Apr. 2011. . "The Electromagnetic Spectrum: NASA." Teachers' Domain. 20 Feb. 2004. Web. 24 Apr. 2011. . "Everyday Radiation." Teachers' Domain. 22 Jan. 2004. Web. 25 Apr. 2011. . "Facts About Radiation." Teachers' Domain. 22 Jan. 2004. Web. 25 Apr. 2011. . "Radio Waves & Electromagnetic Fields." Teachers' Domain. 19 Apr. 2007. Web. 25 Apr. 2011. . "Sources of Radiation." Teachers' Domain. 22 Jan. 2004. Web. 25 Apr. 2011. . "Tour the Electromagnetic Spectrum." Teachers' Domain. 20 Feb. 2004. Web. 25 Apr. 2011. [].

"11 Surprising Facts and Myths About Microwave Ovens.” The Daily Green. Web 25 April 2011. []

Microwave Safety Systems ,2009, Web 25 April 2011. []

<span style="-moz-background-clip: -moz-initial; -moz-background-inline-policy: -moz-initial; -moz-background-origin: -moz-initial; background: white none repeat scroll 0% 0%; color: black; font-size: 14pt; line-height: normal; margin: 0in 0in 10pt;">“Microwave Ovens.” Explain That Stuff. 5 December, 2010. Web 25 April 2011. []

<span style="-moz-background-clip: -moz-initial; -moz-background-inline-policy: -moz-initial; -moz-background-origin: -moz-initial; background: white none repeat scroll 0% 0%; font-family: Calibri; line-height: normal; margin: 0in 0in 10pt;"> Radiation comes in different forms and from different places. Not all radiation is man-made It can come from space, the Sun, and rocks in the earth. Radiation is in almost everything, including some of the food you eat. Not all radiation is bad. Some kinds of radiation are essential for life. Visible light, radio waves, and infrared light are forms of radaiation that do not harm living organisms. Our atmosphere protects us from bad radiation that comes from the Sun and other things in space. The Sun gives off harmful and helpful radiation. UV can cause cancer, but visible light helps us see and infrared radiation keeps us warm. Ultraviolet, x-rays and gamma radiation are harmful. Nuclear power is very efficient but it results in waste that is radioactive in a harmful way. When nuclear reactors are near the ocean, they can make the water form tritium which is radioactive. There is even radiation in homes from concrete and radon in the soil. Over exposure to radon can be dangerous because it can cause lung cancer. Sometimes people accidently throw away radioactive things. These can end up in landfills.
 * Explanation of what electromagnetic raditation is: (based on first 8 sites on Teacher Domain) **

<span style="-moz-background-clip: -moz-initial; -moz-background-inline-policy: -moz-initial; -moz-background-origin: -moz-initial; background: white none repeat scroll 0% 0%; color: black; font-family: Calibri; font-size: 14pt; line-height: normal; margin: 0in 0in 10pt;">The electromagnetic spectrum is divided into seven categories: radio, microwaves, infrared, visible, ultraviolet, x-ray, and gamma rays. Radio waves have the longest wave lengths and are less energetic, while gamma rays have the shortest wavelengths and are the most energetic. Radio waves are used to transfer sound, microwaves are used to cook food, infrared waves keep us warm, the colors in visible light are separated by their wavelengths. Ultrviolet light can burn your skin. X-rays are used for taking pictures of bones. Gamma rays are used in some medical treatment. Ultraviolet, x-rays, and gamma rays can be dangerous and can make you sick.


 * <span style="-moz-background-clip: -moz-initial; -moz-background-inline-policy: -moz-initial; -moz-background-origin: -moz-initial; background: white none repeat scroll 0% 0%; color: black; font-family: Calibri; font-size: 14pt; line-height: normal; margin: 0in 0in 10pt;">How do microwaves the levels of electromagnetic radiation in a microwave effect humans? **

<span style="-moz-background-clip: -moz-initial; -moz-background-inline-policy: -moz-initial; -moz-background-origin: -moz-initial; background: white none repeat scroll 0% 0%; color: black; font-size: 14pt; line-height: normal; margin: 0in 0in 10pt;">No one really knows the effect of long-term exposure to low levels of radiation. Governments regulate the amount of radiation microwaves are allowed to emit to 5 milliwats per square centimeter of radiation at any point 5 cm or more from the oven. This is far below the amount that can hurt people.


 * <span style="-moz-background-clip: -moz-initial; -moz-background-inline-policy: -moz-initial; -moz-background-origin: -moz-initial; background: white none repeat scroll 0% 0%; color: black; font-family: Calibri; font-size: 14pt; line-height: normal; margin: 0in 0in 10pt 0.25in; text-indent: -0.25in;">How do microwaves use electromagnetic radiation? **

<span style="-moz-background-clip: -moz-initial; -moz-background-inline-policy: -moz-initial; -moz-background-origin: -moz-initial; background: white none repeat scroll 0% 0%; color: black; font-size: 14pt; line-height: normal; margin: 0in 0in 10pt;">Microwave ovens use high-powered radio waves to cook food from the inside out. This makes food cook faster than in a regular oven. It also saves energy because you don’t have to wait for the oven to heat up.

<span style="-moz-background-clip: -moz-initial; -moz-background-inline-policy: -moz-initial; -moz-background-origin: -moz-initial; background: white none repeat scroll 0% 0%; color: black; font-size: 14pt; line-height: normal; margin: 0in 0in 10pt;">Microwaves use radiation to warm up food by directly heating food molecules. Microwaves are only 12 cm long but carry a lot of energy. They can hurt living tissue. Microwave ovens are surrounded by metal boxes, so that the microwaves do not escape.

<span style="-moz-background-clip: -moz-initial; -moz-background-inline-policy: -moz-initial; -moz-background-origin: -moz-initial; background: white none repeat scroll 0% 0%; color: black; font-size: 14pt; line-height: normal; margin: 0in 0in 10pt;">Inside the microwave oven there is a microwave generator cfalled a magnetron. This changes electricity into microwaves. As the food spins on a turn-table, the microwaves cook the food evenly. The microwaves pass through the food making the food molecules vibrate. The vibration has heat so it makes the food hot. The faster the molecules move, the hotter the food.

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