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Electro-Magnetic Radiation
If a charged particle is accelerated, electro-magnetic radiation is produced.
For example, radio waves are produced when electrons in the antenna of a radio transmitter are caused to oscillate.
 
Electro-magnetic radiations have wave-like properties and so we often talk about electro-magnetic waves.
However, it should be noted that electro-magnetic radiations also exhibit particle-like properties (see Quantum theory).
 
An electro-magnetic wave consists of oscillating electric and magnetic fields at 90 to each other and to the direction of propagation, as shown here.
 
The Electro-Magnetic Spectrum
The diagram below shows the full range of electro-magnetic radiations in order of wavelength (or frequency)
 
Two things to note:
1. The logarithmic scale of the diagram (for a given distance moved down the diagram, the wavelength changes by a given power of 10).
  This has to be done because the range is so wide; from kilometers to tiny distances, comparable with the size of a nucleus!
2. The visible part of the spectrum is a very very small fraction of the total range.
   
 
 
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