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Electromagnetic radiation
[[File:EM Spectrum Properties edit.svg|thumb|right|200px|Spectrum properties of electromagnetic radiation are diagrammed. Credit: .]]
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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 a wave, so has a wavelength &lambda; and a frequency &nu;.  It is also composed of particles called photons, and each photon has an energy E.  These three quantities are related, and any of them may be used to define the type of radiation.⏎
n Electromagnetic oscillation wave that travels at speed of visible light carries[[Quantum]]'s energy called [[Photon]]
==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]]