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Radiatio electromagnetica in genera varia, secundum undae [[frequentia]]m, classificatur; haec genera, ex ordine frequentia undae augente, longitudine autem decrescente, sunt:
* [[unda radioelectrica|undae radioelectricae]] vel [[unda radiophonica|radiophonicae]] -- frequentia 3 KHz usque ad 300 GHz, longitudo plus quam 1 metrum
* [[unda micrometrica|undae micrometricae]] -- frequentia 10<sup>9</sup> Hz usque ad 10<sup>12</sup>Hz, longitudo 1mm usque ad 1m
* [[unda radiophonica|undae radiophonicae]],
* [[radiatio terahertziana]] -- frequentia fere 1 terahertz, vel 10<sup>12</sup> Hz, longitudo 0.1mm ad 1 mm
* [[unda micrometrica|undae micrometricae]],
* [[radiatio infrarubra]] -- frequentia 10<sup>10</sup> Hz usque ad 4 x 10<sup>12</sup> Hz, longitudo 750 nanometra ad 1 mm; radiatio terahertziana et radiatio micrometrica sunt species radiationis infrarubrae
* [[radiatio terahertziana]],
* [[spectrum visuale|lux visibilis]] -- frequentia 400 - 800 terahertz, longitudo 390 - 700 nanometra
* [[radiatio infrarubra]],
* [[radiatio ultraviolacea]] -- frequentia fere 10<sup>16</sup> Hz, longitudo 10 - 400 nanometra
* [[spectrum visuale|lux visibilis]],
* [[radiatio Roentgensis]] -- frequentia 3 x 10<sup>16</sup> Hz ad 3 x 10<sup>19</sup> Hz, longitudo 0.01 - 1 nanometrum
* [[radiatio ultraviolacea]],
* [[radiatio gamma]] -- frequentia plus quam 10<sup>29</sup> Hz, longitudo minus quam 10 picometra
* [[radiatio Roentgensis]], et
* [[radiatio gamma]].
[[Fasciculus:Electromagneticwave3D.gif|thumb|Propagatio undarum: campus electronicus est in plano verticali, campus magneticus in plano horizontali]]
Undae electromagneticae se movent per materies vel etiam per vacuum. [[Campus physicus|Campus electronicus]] et campus magneticus vibrent, et perpendiculares sunt directioni ubi it [[energia]] undarum.
Electromagnetic radiation (sometimes abbreviated EMR) is a ubiquitous phenomenon that takes the form of self-propagating waves in a vacuum or in matter. It consists of electric and magnetic field components which oscillate in phase perpendicular to each other and perpendicular to the direction of energy propagation. Electromagnetic radiation is classified into several types according to the frequency of its wave; these types include (in order of increasing frequency and decreasing wavelength): radio waves, microwaves, terahertz radiation, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays. A small and somewhat variable window of frequencies is sensed by the eyes of various organisms; this is what we call the visible spectrum, or light.
== Bibliographia ==
* Chari, M. V. K., et S. J. Salon. [[2000]]. ''Numerical Methods in Electromagnetism.'' San Diego: Academic Press. ISBN 012615760X
* Parker, E. N. [[2007]]. ''Conversations on Electric and Magnetic Fields in the Cosmos.'' Princeton: Princeton University Press. ISBN 9780691128412
* Pollack, Gerald L. [[2002]]. ''Electromagnetism.'' Franciscopoli: Addison Wesley. ISBN 0805385673
== Nexus Externi ==
{{CommuniaCat|Electromagnetic spectrum|radiationem electromagneticam}}
* [http://imagine.gsfc.nasa.gov/docs/science/know_l1/emspectrum.html Introductio] apud [[NASA]] (anglice)
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