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Electromagnetic radiation
'''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]]

==Electromagnetic oscillation wave==
(contracted; show full)It follows that a photon with an energy of 1eV has a frequency of 1 eV/h = 2.41799 x 10<sup>14</sup> Hz or about 242 THz and a wavelength of c.h/1 eV = 1.23984 x 10<sup>-6</sup> m or about 1,240nm or 12,400Å.  As will be seen below, that would put the photon in the infrared range.  In practice, photon energies are never quoted for such long wavelengths.

'''Exercise:''' Find why photon energies are only important at very short wavelengths.





== See also ==
* [[Electromagnetic fields and waves]]⏎
⏎
==Ultraviolets==
{{main|Radiation/Ultraviolets|Ultraviolet radiation|Ultraviolets}}
'''Ultraviolet radiation''' was discovered by Johann Wilhelm Ritter in 1801.

There are several terms used.

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