Difference between revisions of "Radiation"
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| − | *Date: [ | + | *Date: [https://www.wikipedia.org/wiki/15th_Century 15th century] |
==Definitions== | ==Definitions== | ||
*1 a : the [[action]] or [[process]] of radiating | *1 a : the [[action]] or [[process]] of radiating | ||
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*3 : radial arrangement | *3 : radial arrangement | ||
==Description== | ==Description== | ||
| − | In [[physics]], '''radiation''' describes any [[process]] in which [[energy]] [[travel]]s through a [[medium]] or through [[space]], ultimately to be absorbed by another [[body]]. Non-physicists often [[associate]] the [[word]] [ | + | In [[physics]], '''radiation''' describes any [[process]] in which [[energy]] [[travel]]s through a [[medium]] or through [[space]], ultimately to be absorbed by another [[body]]. Non-physicists often [[associate]] the [[word]] [https://en.wikipedia.org/wiki/Ionizing_radiation ionizing radiation] (e.g., as occurring in nuclear weapons, nuclear reactors, and [https://en.wikipedia.org/wiki/Radioactive_decay radioactive] substances), but it can also refer to [[electromagnetic]] radiation (i.e., [https://en.wikipedia.org/wiki/Radio_waves radio waves], [https://en.wikipedia.org/wiki/Infrared infrared light], [https://en.wikipedia.org/wiki/Light visible light], [https://en.wikipedia.org/wiki/Ultraviolet ultraviolet light], and [[X-ray]]s) which can also be ionizing radiation, to [https://en.wikipedia.org/wiki/Sound acoustic radiation], or to other more obscure [[processes]]. What makes it radiation is that the [[energy]] radiates (i.e., it [[travels]] outward in straight lines in all directions) from the [[source]]. This [[geometry]] naturally leads to a [[system]] of [[measurements]] and [[physical]] [[units]] that are [[equally]] [[applicable]] to all [[types]] of radiation.[https://en.wikipedia.org/wiki/Radiation] |
[[Category: Physics]] | [[Category: Physics]] | ||
Latest revision as of 02:30, 13 December 2020
- Date: 15th century
Definitions
- b : the process of emitting radiant energy in the form of waves or particles
- c (1) : the combined processes of emission, transmission, and absorption of radiant energy (2) : the transfer of heat by radiation — compare conduction, convection
- 2 a : something that is radiated
- 3 : radial arrangement
Description
In physics, radiation describes any process in which energy travels through a medium or through space, ultimately to be absorbed by another body. Non-physicists often associate the word ionizing radiation (e.g., as occurring in nuclear weapons, nuclear reactors, and radioactive substances), but it can also refer to electromagnetic radiation (i.e., radio waves, infrared light, visible light, ultraviolet light, and X-rays) which can also be ionizing radiation, to acoustic radiation, or to other more obscure processes. What makes it radiation is that the energy radiates (i.e., it travels outward in straight lines in all directions) from the source. This geometry naturally leads to a system of measurements and physical units that are equally applicable to all types of radiation.[1]
