The Electromagnetic Spectrum and Bandwidth
This section talks about bandwidth and about where the various transmission media lie within the electromagnetic spectrum.
The Electromagnetic Spectrum
When electrons move, they create electromagnetic waves that can propagate through free space. This phenomenon was first predicted to exist by James Maxwell, in 1865, and it was first produced and observed by Heinrich Hertz in 1887. All modern communication depends on manipulating and controlling signals within the electromagnetic spectrum.
The electromagnetic spectrum ranges from extremely low-frequency radio waves of 30Hz, with wavelengths of nearly the earth's diameter, to high-frequency cosmic rays of more than 10 million trillion Hz, with wavelengths ...
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