Difference between revisions 1695558 and 1695561 on enwikiversity

'''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==
Electromagnetic oscillation can be describe by 4 Maxwell's vector equations
: <math>\nabla \cdot E = 0</math>
: <math>\nabla \times E = \frac{1}{T} E</math>
: <math>\nabla \cdot B = 0</math>
: <math>\nabla \times B = \frac{1}{T} B</math>

Yield electromagnetic [[Wave equation]]
: <math>\nabla^2 E = - \omega E</math>
: <math>\nabla^2 B = - \omega B</math>

Solve those equations above gives electromagnetic [[Wave function]]
: <math>E = A Sin \omega t</math>
: <math>B = A Sin \omega t</math>

Provided that
: <math>\omega = \sqrt{\frac{1}{T}}</math>
: <math>T = \mu \epsilon</math>

==Electromagnetic radiation spectrum==⏎
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: [[File:EM Spectrum Properties edit.svg|thumb|right|500px]]
===Frequency Bands=Electromagnetic radiation spectrum==
{{main|Radiation astronomy/Bands|Band astronomy}}
The electromagnetic spectrum is divided into several bands.  These definitions are generally informal and vague, and the bands may overlap.  There seems to be a gap between the ultra-violet and X-ray bands.  Sometimes, the choice of band depends on how the radiation is generated.  For example, radiation from radioactive decay is always referred to as gamma rays, even if its photon energy would class it as X-rays.

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

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