Ignacio

Microwave wavelength's range is from one millimeter to thirty centimeters. Microwaves are emitted from earth, objects and the atmosphere. =How does a microwave oven use radiation?= Microwave radiation can't destroy atoms. Scientists don't think it harms animals or humans's DNA like gamma rays and xrays. But they cause heating effects that will harm you or kill you when it has a high energy. Microwave ovens that can be bought in normal stores work within strict federal limits. N ormal microwave ovens use about 2.45 GhZ(giga hertz).

Perry Spencer invented the microwave oven in 1946. He was working on a machine that produced microwaves when a candy bar in his pocket melted. After a while he put some popcorn kernels beside the device and they exploded. After a few minutes they exploded. Then, he put an egg and it cooked so fast it exploded. He had discovered a new form of cooking.

Cooking with microwave ovens
Microwaves work by how they are reflected and absorbed. In a microwave oven, the microwaves reflect in the metal walls of the cooking chamber. The waves go through wrappings such as plastic, glass and paper. But are absorbed by the food. The energy from the microwaves make the water and fat particles vibrate. This vibration creates heat, and this heat cooks the food =How do microwave ovens affect health?= They don't cook food the same in all places. This makes food to be too raw. There are serious health problems caused by eating undercooked poultry and meats. another danger of microwaves is that you can scald yourself with overheated water. What happens is that when water is heated n a microwave in a ceramic or glass container it prevents cooling bubbles from forming. The water heats up past its boiling point. So when it is disturbed by moving it or dropping something in it, the heat releases violently and erupts boiling water out of the cup. This can result in very serious scalds to your hands, arms and body. = Conclusion = Microwave ovens are fast and useful but they can cause serious health risks so its better not to use them to cook everything

. "The electromagnetic spectrum." //Msradianttech//. Web. 29 Mar 2011. . "Electromsgnetic spectrum." //Ntu.edu.sg//. N.p., n.d. Web. 29 Mar 2011. . Howard, Brian Clark. "11 surprising facts about microwaves." //lifestyle.msn.com//. Microsoft, n.d. Web. 1 Apr 2011. . Pasachoff, Jay.M. //Prentice hall science explorer: Sound and Light//. 1st ed. Boston, Massachusetts: Pearson Education, 2007. 82-83. Print