If you're one of those people, who bask the convenience of your cell phone and maintain it at your side 24 hours a day, there are opportunities that you may have got electromagnetic radiations in your hand. Cellular phones emit this kind of radiations, and we (almost all) are affected by it. It’s effect might be up to cellular level.
Even the computers emit this kind of radiations. It is not something that is going to impact you badly if you only leap on the computing machine once in a while. But there are many people that work on a computing machine all twenty-four hours long. In fact, those that work from place on the computing machine may remain in presence of it much more than person who works at an business office on the computer. This is when you might get putting yourself at hazard from electromagnetic radiation.
Apart from these, there are many other things that emit such radiations. Some of them are like - microwaves, convection ovens, laptop computers, etc. These things may not be considered as noxious as a computer or cell phone, because you don't stand up there with the convection oven pressed to your ear all twenty-four hours long.
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| Author: nikhilraj 27 Dec 2007 | Member Level: Bronze | Rating:  Points: 0 |
RF Radiation.doc |
| Author: ganesh babu 02 Jan 2008 | Member Level: Silver | Rating: Points: 5 |
Theory
Electromagnetic waves were first predicted by James Clerk Maxwell and subsequently confirmed by Heinrich Hertz. Maxwell derived a wave form of the electric and magnetic equations, revealing the wave-like nature of electric and magnetic fields, and their symmetry. Because the speed of EM waves predicted by the wave equation coincided with the measured speed of light, Maxwell concluded that light itself is an EM wave.
According to Maxwell's equations, a time-varying electric field generates a magnetic field and vice versa. Therefore, as an oscillating electric field generates an oscillating magnetic field, the magnetic field in turn generates an oscillating electric field, and so on. These oscillating fields together form an electromagnetic wave.
A quantum theory of the interaction between electromagnetic radiation and matter such as electrons is described by the theory of quantum electrodynamics.
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