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What are Electromagnetic Waves? August 25, 2006

Posted by healthyself in 12000 volts, 16 Hz, 17.6 Hz, 200 gauss, 50 Hz, 500 Volts, 5000 volts, 60 Hz Magnetic Fields, 8W/kg, 900 mHz, Beneficial frequencies, Beta Rhythm, Biofield, Blogroll, Cell phone industry, Cell phone safety, Cell phone towers, Coherence, Communication, Definitions, Electromagnetic pollution, Electromagnetic waves, Electrosensitivity, Electrosmog, ELF, EMF Research, EMR, Environment, GHz, Harmonics, High Frequencies, high voltage transmission lines, Microwave exposure, mobile telephones, Noise, Pulsed Radiation, Quantum Physics, radiation, Research, Safe Levels, Safety, SAR, Transfer, transmission, VDT, Vibration, Waves.

Electromagnetic radiation is generally described as a self-propagating wave in space with electric and magnetic components. These components oscillate at right angles to each other and to the direction of propagation, and are in phase with each other. Electromagnetic radiation is classified into types according to the frequency of the wave: these types include, in order of increasing frequency, radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays. In some technical contexts the entire range is referred to as just ‘light’. [1]

EM radiation carries energy and momentum, which may be imparted when it interacts with matter.

Electromagnetic waves of much lower frequency than visible light were first predicted by Maxwell’s equations and subsequently discovered by Heinrich Hertz. Maxwell derived a wave form of the electric and magnetic equations, revealing the wavelike nature of electric and magnetic fields and their symmetry.

According to these 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.

Light-wave.png (20KB, MIME type: image/png)



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