Explain Electromagnetic spectrum.

Explain Electromagnetic spectrum. 
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The information signal should be first converted into an electromagnetic signal before transmission because the wireless transmission takes place using electromagnetic waves. The electromagnetic waves are oscillations which propagate through free space. The electromagnetic wave consists of both electric and magnetic fields. The electromagnetic waves can travel a long distance through space. In electromagnetic waves, the direction of electric field, magnetic field & propagation are mutually perpendicular. Since the oscillations are perpendicular to direction of propagations of waves they are said to be transverse waves. The frequency of electromagnetic signals ranges from few Hertz to several GHz. This entire range of frequency of EM waves is called EM spectrum.

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