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Electromagnetic radiation
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'''Electromagnetic radiation''' comes in many different types, although the differences between them are quantitative rather than qualitative.  This teaching aid lists the different types that are generally recognised.

Electromagnetic radiation is an Electromagnetic oscillation wave that travels at speed of visible light carries[[Quantum]]'s energy called [[Photon]]⏎
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: [[File:EM Spectrum Properties edit.svg|thumb|right|200px]]
==Units==
{{main|Units}}
Scientists usually use SI units.  The unit of frequency is the hertz (Hz), one cycle per second, named after Heinrich Hertz.  For our purposes, we shall use much higher frequencies.  One thousand Hz is a kHz (kilohertz); one thousand kHz is a MHz (megahertz); one thousand MHz is a GHz (gigahertz); one thousand GHz is a THz (terahertz).

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== See also ==
* [[Electromagnetic fields and waves]]

==External links==
[[Category:Physics]]
[[Category:Radiation]]
[[Category:Resources last modified in August 2016]]