Radiation - Revision history

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energy>Jmdonev at 18:20, 25 June 2026

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	Objects emit thermal radiation because they're at a [[temperature]] that isn't perfectly cold ([[absolute zero]] Kelvin). The thermal energy makes an objects' molecules wiggle. Molecules have electric charge, and that wiggling makes changing electric fields, which makes for radiation. The higher the temperature, the faster the wiggling of the molecules. Objects hotter than ~500°C (773 K) start to emit visible light.<ref>The light starts off being red, and then moves through the spectrum as the temperature increases, for more information see: UCSB Science Line, accessed May 10th, 2022. http://scienceline.ucsb.edu/getkey.php?key=6064</ref>		Objects emit thermal radiation because they're at a [[temperature]] that isn't perfectly cold ([[absolute zero]] Kelvin). The thermal energy makes an objects' molecules wiggle. Molecules have electric charge, and that wiggling makes changing electric fields, which makes for radiation. The higher the temperature, the faster the wiggling of the molecules. Objects hotter than ~500°C (773 K) start to emit visible light.<ref>The light starts off being red, and then moves through the spectrum as the temperature increases, for more information see: UCSB Science Line, accessed May 10th, 2022. http://scienceline.ucsb.edu/getkey.php?key=6064</ref>

	Objects cooler than ~500°C emit radiation that not visible to the naked eye (see [[Wiens Law]] for more information]]. Infrared cameras are able to pick up this invisible radiation and digitally convert it into a visible image (such as the one shown in Figure 4). Sometimes this radiant heat is visible. For example, a candle radiates heat. It also gives out visible light, which corresponds with the temperature of the flame. The flame burns hottest at the wick, and gives off blue or white light as it is on the higher end of the visible light spectrum. Surrounding the wick, the flame is yellow and then red in appearance, which is at the lower end of the visible light spectrum. The region surrounding the flame gives off no light as it emits infrared waves, but feels warm to the touch.		Objects cooler than ~500°C emit radiation that not visible to the naked eye (see [[Wiens Law\|Wien's Law]] for more information). Infrared cameras are able to pick up this invisible radiation and digitally convert it into a visible image (such as the one shown in Figure 4). Sometimes this radiant heat is visible. For example, a candle radiates heat. It also gives out visible light, which corresponds with the temperature of the flame. The flame burns hottest at the wick, and gives off blue or white light as it is on the higher end of the visible light spectrum. Surrounding the wick, the flame is yellow and then red in appearance, which is at the lower end of the visible light spectrum. The region surrounding the flame gives off no light as it emits infrared waves, but feels warm to the touch.

	==Sunlight==		==Sunlight==

Jmdonev at 16:36, 10 May 2022

2022-05-10T16:36:45Z

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	==Thermal Radiation==		==Thermal Radiation==
	Thermal radiation is one type of electromagnetic radiation that ~~is talked about in great detail. In terms of~~ [[heat]] ~~transfer, radiation is the emission of thermal energy~~ in the form of infrared waves.~~<ref> H.Michigan, T. U. Morgan. (November 1, 2013). “Big Ideas in Volcanology: Volcanic Heat.” [Online]. Available: http://www.geo.mtu.edu/~hamorgan/bigideaswelcome.html</ref>~~ Generally, thermal radiation and infrared waves are referred to simply as "heat". Since heat is carried by electromagnetic waves, it does not need a physical medium to transfer it. Instead it radiates through space - this is how the Earth is heated by the Sun despite space being a [[vacuum]].<ref>Heat: Heat Transfer. (August 6, 2015). ''Radiation - Page 1.'' [Online]. Available: http://www.hk-phy.org/contextual/heat/hea/radia01_e.html.</ref>		Thermal radiation is one type of electromagnetic radiation, specifically one that transfers [[heat]] often in the form of infrared waves. Generally, thermal radiation and infrared waves are referred to simply as "heat". Since heat is carried by electromagnetic waves, it does not need a physical medium to transfer it. Instead it radiates through space - this is how the Earth is heated by the Sun despite space being a [[vacuum]].<ref>Heat: Heat Transfer. (August 6, 2015). ''Radiation - Page 1.'' [Online]. Available: http://www.hk-phy.org/contextual/heat/hea/radia01_e.html.</ref>

	[[File:Infrared_dog.jpg\|360px\|framed\|right\|Figure 4. A dog as seen in the infrared spectrum.<ref>Wikimedia Commons. (August 6, 2015). ''Infrared Dog'' [Online]. Available: http://upload.wikimedia.org/wikipedia/commons/0/0c/Infrared_dog.jpg</ref>]]		[[File:Infrared_dog.jpg\|360px\|framed\|right\|Figure 4. A dog as seen in the infrared spectrum.<ref>Wikimedia Commons. (August 6, 2015). ''Infrared Dog'' [Online]. Available: http://upload.wikimedia.org/wikipedia/commons/0/0c/Infrared_dog.jpg</ref>]]

	~~All objects~~ at ~~normal~~ [[temperature]] emit ~~thermal~~ radiation~~; however it is~~ not visible to the naked eye. Infrared cameras are able to pick up this invisible radiation and digitally convert it into a visible image (such as the one shown in Figure 4). Sometimes this radiant heat is visible. For example, a candle radiates heat. It also gives out visible light, which corresponds with the temperature of the flame. The flame burns hottest at the wick, and gives off blue or white light as it is on the higher end of the visible light spectrum. Surrounding the wick, the flame is yellow and then red in appearance, which is at the lower end of the visible light spectrum. The region surrounding the flame gives off no light as it emits infrared waves, but feels warm to the touch.		Objects emit thermal radiation because they're at a [[temperature]] that isn't perfectly cold ([[absolute zero]] Kelvin). The thermal energy makes an objects' molecules wiggle. Molecules have electric charge, and that wiggling makes changing electric fields, which makes for radiation. The higher the temperature, the faster the wiggling of the molecules. Objects hotter than ~500°C (773 K) start to emit visible light.<ref>The light starts off being red, and then moves through the spectrum as the temperature increases, for more information see: UCSB Science Line, accessed May 10th, 2022. http://scienceline.ucsb.edu/getkey.php?key=6064</ref>

			Objects cooler than ~500°C emit radiation that not visible to the naked eye (see [[Wiens Law]] for more information]]. Infrared cameras are able to pick up this invisible radiation and digitally convert it into a visible image (such as the one shown in Figure 4). Sometimes this radiant heat is visible. For example, a candle radiates heat. It also gives out visible light, which corresponds with the temperature of the flame. The flame burns hottest at the wick, and gives off blue or white light as it is on the higher end of the visible light spectrum. Surrounding the wick, the flame is yellow and then red in appearance, which is at the lower end of the visible light spectrum. The region surrounding the flame gives off no light as it emits infrared waves, but feels warm to the touch.

	==Sunlight==		==Sunlight==

Jmdonev: 1 revision imported

2021-12-20T19:47:18Z

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energy>Jmdonev at 21:53, 9 December 2021

2021-12-09T21:53:33Z

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			[[es:Radiación]]
	[[fr:Rayonnement]]		[[fr:Rayonnement]]
	<onlyinclude>'''Radiation''' is the emission or transmission of energy in a straight line (like a 'ray' in geometry'). This line travels through space or some material, spreading out from the source in all directions; "radiating" out. Radiation can also refer to the emitted energy itself.</onlyinclude> There are many different types of radiation that can include electromagnetic, thermal, acoustic, [[particle]] radiation (such as alpha or beta radiation from a radioactive source), and [[ionizing radiation]].<ref name="RE1">Randall D. Knight. ''Physics for Scientists and Engineers: A Strategic Approach'', 3rd ed.Glenview, IL, U.S.A.: Pearson Education, 2013</ref>		<onlyinclude>'''Radiation''' is the emission or transmission of energy in a straight line (like a 'ray' in geometry'). This line travels through space or some material, spreading out from the source in all directions; "radiating" out. Radiation can also refer to the emitted energy itself.</onlyinclude> There are many different types of radiation that can include electromagnetic, thermal, acoustic, [[particle]] radiation (such as alpha or beta radiation from a radioactive source), and [[ionizing radiation]].<ref name="RE1">Randall D. Knight. ''Physics for Scientists and Engineers: A Strategic Approach'', 3rd ed.Glenview, IL, U.S.A.: Pearson Education, 2013</ref>

Jmdonev: 1 revision imported

2021-09-27T00:03:01Z

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energy>Ethan.boechler at 18:19, 18 June 2021

2021-06-18T18:19:23Z

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			[[fr:Rayonnement]]
	<onlyinclude>'''Radiation''' is the emission or transmission of energy in a straight line (like a 'ray' in geometry'). This line travels through space or some material, spreading out from the source in all directions; "radiating" out. Radiation can also refer to the emitted energy itself.</onlyinclude> There are many different types of radiation that can include electromagnetic, thermal, acoustic, [[particle]] radiation (such as alpha or beta radiation from a radioactive source), and [[ionizing radiation]].<ref name="RE1">Randall D. Knight. ''Physics for Scientists and Engineers: A Strategic Approach'', 3rd ed.Glenview, IL, U.S.A.: Pearson Education, 2013</ref>		<onlyinclude>'''Radiation''' is the emission or transmission of energy in a straight line (like a 'ray' in geometry'). This line travels through space or some material, spreading out from the source in all directions; "radiating" out. Radiation can also refer to the emitted energy itself.</onlyinclude> There are many different types of radiation that can include electromagnetic, thermal, acoustic, [[particle]] radiation (such as alpha or beta radiation from a radioactive source), and [[ionizing radiation]].<ref name="RE1">Randall D. Knight. ''Physics for Scientists and Engineers: A Strategic Approach'', 3rd ed.Glenview, IL, U.S.A.: Pearson Education, 2013</ref>

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	:: [[electromagnetic radiation\| ''main article'']]		:: [[electromagnetic radiation\| ''main article'']]

	Electromagnetic radiation is produced by accelerating ~~charges and moves~~ through space ~~as with~~ its [[electric field\|electric]] and magnetic fields ~~oscillating~~ like in figure 2.<ref name="RE1"/> This radiation is also known as an electromagnetic wave as it is composed of alternating [[electric field\|electric]] and [[magnetic field]]s. This type of radiation comes in discrete packets known as [[photon]]s.		Electromagnetic radiation is produced by charged particles accelerating through space. As the charge moves, its [[electric field\|electric]] and magnetic fields oscillate like in figure 2.<ref name="RE1"/> This radiation is also known as an electromagnetic wave as it is composed of alternating [[electric field\|electric]] and [[magnetic field]]s. This type of radiation comes in discrete packets known as [[photon]]s.

	There are several different types of electromagnetic radiation, and their properties depend on their energy and wavelength. Some of the different types include radio waves, [[infrared radiation]] (felt as heat), microwaves, visible [[light]], [[ultraviolet radiation]], [[x-ray]]s, [[gamma decay\|gamma ray]]s, and cosmic rays.		There are several different types of electromagnetic radiation, and their properties depend on their energy and wavelength. Some of the different types include radio waves, [[infrared radiation]] (felt as heat), microwaves, visible [[light]], [[ultraviolet radiation]], [[x-ray]]s, [[gamma decay\|gamma ray]]s, and cosmic rays.

Jmdonev: 1 revision imported

2020-04-28T15:32:21Z

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energy>Jmdonev at 20:15, 17 February 2020

2020-02-17T20:15:14Z

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	~~[[Category: Rudi grade Ashley edit~~]]		<onlyinclude>'''Radiation''' is the emission or transmission of energy in a straight line (like a 'ray' in geometry'). This line travels through space or some material, spreading out from the source in all directions; "radiating" out. Radiation can also refer to the emitted energy itself.</onlyinclude> There are many different types of radiation that can include electromagnetic, thermal, acoustic, [[particle]] radiation (such as alpha or beta radiation from a radioactive source), and [[ionizing radiation]].<ref name="RE1">Randall D. Knight. ''Physics for Scientists and Engineers: A Strategic Approach'', 3rd ed.Glenview, IL, U.S.A.: Pearson Education, 2013</ref>
	<onlyinclude>'''Radiation''' is the emission or transmission of energy through space or some material ~~in the form of a [[wave]]. This radiation spreads~~ out from the source in all directions ~~and~~ "~~radiates~~" out. Radiation can also refer to the emitted energy itself.</onlyinclude> There are many different types of radiation that can include electromagnetic, thermal, acoustic, [[particle]] radiation (such as alpha or beta radiation from a radioactive source), and [[ionizing radiation]].<ref name="RE1">Randall D. Knight. ''Physics for Scientists and Engineers: A Strategic Approach'', 3rd ed.Glenview, IL, U.S.A.: Pearson Education, 2013</ref>

	==Ionizing versus Non-Ionizing Radiation==		==Ionizing versus Non-Ionizing Radiation==
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	==Electromagnetic Radiation==		==Electromagnetic Radiation==
			[[File:Electromagneticwave3D.gif\|300px\|framed\|right\|Figure 2. The electric (red) and magnetic (blue) fields are changing, causing the radiation moving to the right.]]
	:: [[electromagnetic radiation\| ''main article'']]		:: [[electromagnetic radiation\| ''main article'']]

	Electromagnetic radiation ~~is a type of radiation of energy that moves as a series of alternating waves and~~ is produced by accelerating charges.<ref name="RE1"/> This radiation is also known as an electromagnetic wave as it is composed of alternating [[electric field\|electric]] and [[magnetic field]]s. This type of radiation comes in discrete packets known as [[photon]]s.		Electromagnetic radiation is produced by accelerating charges and moves through space as with its [[electric field\|electric]] and magnetic fields oscillating like in figure 2.<ref name="RE1"/> This radiation is also known as an electromagnetic wave as it is composed of alternating [[electric field\|electric]] and [[magnetic field]]s. This type of radiation comes in discrete packets known as [[photon]]s.

	There are several different types of electromagnetic radiation, and their properties depend on their energy and wavelength. Some of the different types include radio waves, [[infrared radiation]] (felt as heat), microwaves, visible [[light]], [[ultraviolet radiation]], [[x-ray]]s, [[gamma decay\|gamma ray]]s, and cosmic rays.		There are several different types of electromagnetic radiation, and their properties depend on their energy and wavelength. Some of the different types include radio waves, [[infrared radiation]] (felt as heat), microwaves, visible [[light]], [[ultraviolet radiation]], [[x-ray]]s, [[gamma decay\|gamma ray]]s, and cosmic rays.

	Long wavelength electromagnetic radiation (radio to visible light waves) are generally non-ionizing. Shorter wavelength electromagnetic radiation (ultraviolet light to gamma rays) tends to be ionizing (Figure 2).<ref name="CDC"/>		Long wavelength electromagnetic radiation (radio to visible light waves) are generally non-ionizing. Shorter wavelength electromagnetic radiation (ultraviolet light to gamma rays) tends to be ionizing (Figure 3).<ref name="CDC"/>

	[[File:IonizingVSnon-ionizing.jpg\|800 px\|thumb\|framed\|centre\|Figure 2. The electromagnetic spectrum divided into ionizing and non-ionizing radiation.<ref>Mirion Technologies. "What is radiation?" Oct 9, 2018. Available from: https://www.mirion.com/introduction-to-radiation-safety/what-is-radiation/</ref>]]

			[[File:IonizingVSnon-ionizing.jpg\|800 px\|thumb\|framed\|centre\|Figure 3. The electromagnetic spectrum divided into ionizing and non-ionizing radiation.<ref>Mirion Technologies. "What is radiation?" Oct 9, 2018. Available from: https://www.mirion.com/introduction-to-radiation-safety/what-is-radiation/</ref>]]

	==Thermal Radiation==		==Thermal Radiation==
	Thermal radiation is one type of electromagnetic radiation that is talked about in great detail. In terms of [[heat]] transfer, radiation is the emission of thermal energy in the form of infrared waves.<ref> H.Michigan, T. U. Morgan. (November 1, 2013). “Big Ideas in Volcanology: Volcanic Heat.” [Online]. Available: http://www.geo.mtu.edu/~hamorgan/bigideaswelcome.html</ref> Generally, thermal radiation and infrared waves are referred to simply as "heat". Since heat is carried by electromagnetic waves, it does not need a physical medium to transfer it. Instead it radiates through space - this is how the Earth is heated by the Sun despite space being a [[vacuum]].<ref>Heat: Heat Transfer. (August 6, 2015). ''Radiation - Page 1.'' [Online]. Available: http://www.hk-phy.org/contextual/heat/hea/radia01_e.html.</ref>		Thermal radiation is one type of electromagnetic radiation that is talked about in great detail. In terms of [[heat]] transfer, radiation is the emission of thermal energy in the form of infrared waves.<ref> H.Michigan, T. U. Morgan. (November 1, 2013). “Big Ideas in Volcanology: Volcanic Heat.” [Online]. Available: http://www.geo.mtu.edu/~hamorgan/bigideaswelcome.html</ref> Generally, thermal radiation and infrared waves are referred to simply as "heat". Since heat is carried by electromagnetic waves, it does not need a physical medium to transfer it. Instead it radiates through space - this is how the Earth is heated by the Sun despite space being a [[vacuum]].<ref>Heat: Heat Transfer. (August 6, 2015). ''Radiation - Page 1.'' [Online]. Available: http://www.hk-phy.org/contextual/heat/hea/radia01_e.html.</ref>

	[[File:Infrared_dog.jpg\|360px\|framed\|right\|Figure 3. A dog as seen in the infrared spectrum.<ref>Wikimedia Commons. (August 6, 2015). ''Infrared Dog'' [Online]. Available: http://upload.wikimedia.org/wikipedia/commons/0/0c/Infrared_dog.jpg</ref>]]		[[File:Infrared_dog.jpg\|360px\|framed\|right\|Figure 4. A dog as seen in the infrared spectrum.<ref>Wikimedia Commons. (August 6, 2015). ''Infrared Dog'' [Online]. Available: http://upload.wikimedia.org/wikipedia/commons/0/0c/Infrared_dog.jpg</ref>]]

	All objects at normal [[temperature]] emit thermal radiation; however it is not visible to the naked eye. Infrared cameras are able to pick up this invisible radiation and digitally convert it into a visible image (such as the one shown in Figure 3). Sometimes this radiant heat is visible. For example, a candle radiates heat. It also gives out visible light, which corresponds with the temperature of the flame. The flame burns hottest at the wick, and gives off blue or white light as it is on the higher end of the visible light spectrum. Surrounding the wick, the flame is yellow and then red in appearance, which is at the lower end of the visible light spectrum. The region surrounding the flame gives off no light as it emits infrared waves, but feels warm to the touch.		All objects at normal [[temperature]] emit thermal radiation; however it is not visible to the naked eye. Infrared cameras are able to pick up this invisible radiation and digitally convert it into a visible image (such as the one shown in Figure 4). Sometimes this radiant heat is visible. For example, a candle radiates heat. It also gives out visible light, which corresponds with the temperature of the flame. The flame burns hottest at the wick, and gives off blue or white light as it is on the higher end of the visible light spectrum. Surrounding the wick, the flame is yellow and then red in appearance, which is at the lower end of the visible light spectrum. The region surrounding the flame gives off no light as it emits infrared waves, but feels warm to the touch.

	==Sunlight==		==Sunlight==
	:: [[~~sunlight\| ''main article''~~]]		[[Sunlight]], also called solar radiation, is a form of radiation that originated from the [[Sun]]. The radiation is part of the electromagnetic spectrum, including [[infrared]], visible, and [[ultraviolet]] [[light]]. Sunlight that is incident upon the Earth's surface has been filtered through the [[atmosphere]], with some of the ultraviolet radiation being absorbed.<ref>ScienceDaily. (May 20, 2015). ''Sunlight'' [Online]. Available: http://www.sciencedaily.com/terms/solar_radiation.htm</ref> In addition to providing light for Earth, sunlight also acts as a source of [[radiant heat]], warming the Earth.
	~~Sunlight~~, also called solar radiation, is a form of radiation that originated from the [[Sun]]. The radiation is part of the electromagnetic spectrum, including [[infrared]], visible, and [[ultraviolet]] [[light]]. Sunlight that is incident upon the Earth's surface has been filtered through the [[atmosphere]], with some of the ultraviolet radiation being absorbed.<ref>ScienceDaily. (May 20, 2015). ''Sunlight'' [Online]. Available: http://www.sciencedaily.com/terms/solar_radiation.htm</ref> In addition to providing light for Earth, sunlight also acts as a source of [[radiant heat]], warming the Earth.

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2019-01-04T18:14:54Z

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