Photon - Revision history

Jmdonev at 22:54, 25 January 2023

2023-01-25T22:54:49Z

← Older revision		Revision as of 22:54, 25 January 2023
Line 1:		Line 1:
	~~[[Category: Brodie edit]]~~
	[[Category:Translated to French]]		[[Category:Translated to French]]
			[[Category:Done 2021-06-30]]
	[[fr:Photon]]		[[fr:Photon]]
	<onlyinclude>A '''photon''' is a particle of [[light]] which essentially is a packet of [[electromagnetic radiation]].</onlyinclude> The [[energy]] of the photon depends on its [[frequency]] (how fast the [[electric field]] and [[magnetic field]] wiggle, '''this needs better wording, for 'fast electric field' and 'wiggle''''). The higher the frequency, the more energy the photon has. Of course, a beam of light has many photons. This means that really intense ''red light'' (lots of photons, with slightly lower energy) can carry more [[power]] to a given area than less intense ''blue light'' (fewer photons with higher energy).		<onlyinclude>A '''photon''' is a particle of [[light]] which essentially is a packet of [[electromagnetic radiation]].</onlyinclude> The [[energy]] of the photon depends on its [[frequency]] (how fast the [[electric field]] and [[magnetic field]] wiggle, '''this needs better wording, for 'fast electric field' and 'wiggle''''). The higher the frequency, the more energy the photon has. Of course, a beam of light has many photons. This means that really intense ''red light'' (lots of photons, with slightly lower energy) can carry more [[power]] to a given area than less intense ''blue light'' (fewer photons with higher energy).
Line 18:		Line 18:
	One of the strangest discoveries of [[quantum mechanics]] is that light and other small particles, like photons, are either [http://hyperphysics.phy-astr.gsu.edu/hbase/mod1.html#c1 waves or particles] depending on the experiment that measures them. When light passes through a prism they spread out according to wavelength.		One of the strangest discoveries of [[quantum mechanics]] is that light and other small particles, like photons, are either [http://hyperphysics.phy-astr.gsu.edu/hbase/mod1.html#c1 waves or particles] depending on the experiment that measures them. When light passes through a prism they spread out according to wavelength.

	Contrarily, ~~bombard~~ metal with light, ~~and it displays a~~ particle side of ~~its~~ nature~~, where only~~ photons ~~that have more than~~ a specific ~~amount of~~ energy release [[electron]]s.		Contrarily, when bombarding metal with light, photons display the particle side of their nature. When photons exceed a specific energy threshold, they release energy to the metal's [[electron]]s. The excited electrons, having too much energy to maintain orbit, are ejected from the metal.

	This experiment, called the [http://hyperphysics.phy-astr.gsu.edu/hbase/mod1.html#c2 photoelectric effect], is what won [http://www.nobelprize.org/nobel_prizes/physics/laureates/1921/ Einstein his Nobel Prize]. Photons with insufficient energy can hit metal, yet won't knock any electrons loose. Photons that exceed a threshold energy usually do knock the electrons loose, however, as the photon's energy becomes much greater than necessary the likelihood that it ejects an electron diminishes. Thus a low total energy beam of violet light might eject electrons from a particular metal, where a high energy red beam fails to eject one. Since each photon in the red beam has lower energy, there are many more of them. This discovery is what led to the quantum revolution in physics. Classical physics and intuition both wrongly conclude that the total energy of the beam would be the most important factor in ejecting electrons.		This experiment, called the [http://hyperphysics.phy-astr.gsu.edu/hbase/mod1.html#c2 photoelectric effect], is what won [http://www.nobelprize.org/nobel_prizes/physics/laureates/1921/ Einstein his Nobel Prize]. Photons with insufficient energy can hit metal, yet won't knock any electrons loose. Photons that exceed a threshold energy usually do knock the electrons loose, however, as the photon's energy becomes much greater than necessary the likelihood that it ejects an electron diminishes. Thus a low total energy beam of violet light might eject electrons from a particular metal, where a high energy red beam fails to eject one. Since each photon in the red beam has lower energy, there are many more of them. This discovery is what led to the quantum revolution in physics. Classical physics and intuition both wrongly conclude that the total energy of the beam would be the most important factor in ejecting electrons.

Jmdonev at 21:16, 22 October 2021

2021-10-22T21:16:48Z

← Older revision		Revision as of 21:16, 22 October 2021
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	[[Category:Translated to French]]		[[Category:Translated to French]]
	[[fr:Photon]]		[[fr:Photon]]
	~~'''Brodie, Bethel made some notes. Also, I wanted to make sure that this fit into your PV pages. Thoughts? - Jason'''~~

	~~'''NOTES: I made note of some things that didn't make sense to me in bold'''~~

	~~'''Also, picture?'''~~

	<onlyinclude>A '''photon''' is a particle of [[light]] which essentially is a packet of [[electromagnetic radiation]].</onlyinclude> The [[energy]] of the photon depends on its [[frequency]] (how fast the [[electric field]] and [[magnetic field]] wiggle, '''this needs better wording, for 'fast electric field' and 'wiggle''''). The higher the frequency, the more energy the photon has. Of course, a beam of light has many photons. This means that really intense ''red light'' (lots of photons, with slightly lower energy) can carry more [[power]] to a given area than less intense ''blue light'' (fewer photons with higher energy).		<onlyinclude>A '''photon''' is a particle of [[light]] which essentially is a packet of [[electromagnetic radiation]].</onlyinclude> The [[energy]] of the photon depends on its [[frequency]] (how fast the [[electric field]] and [[magnetic field]] wiggle, '''this needs better wording, for 'fast electric field' and 'wiggle''''). The higher the frequency, the more energy the photon has. Of course, a beam of light has many photons. This means that really intense ''red light'' (lots of photons, with slightly lower energy) can carry more [[power]] to a given area than less intense ''blue light'' (fewer photons with higher energy).

Jmdonev: 1 revision imported

2021-09-27T00:03:07Z

1 revision imported

← Older revision	Revision as of 00:03, 27 September 2021
(No difference)

energy>Ethan.boechler at 20:00, 10 September 2021

2021-09-10T20:00:25Z

← Older revision		Revision as of 20:00, 10 September 2021
Line 1:		Line 1:
	[[Category:~~Done 2018-05-18~~]]		[[Category: Brodie edit]]
	<onlyinclude>A '''photon''' is a particle of [[light]] which essentially is a packet of [[electromagnetic radiation]].</onlyinclude> The [[energy]] of the photon depends on its [[frequency]] (how fast the [[electric field]] and [[magnetic field]] wiggle). The higher the frequency, the more energy the photon has. Of course, a beam of light has many photons. This means that really intense ''red light'' (lots of photons, with slightly lower energy) can carry more [[power]] to a given area than less intense ''blue light'' (fewer photons with higher energy).		[[Category:Translated to French]]
			[[fr:Photon]]
			'''Brodie, Bethel made some notes. Also, I wanted to make sure that this fit into your PV pages. Thoughts? - Jason'''

			'''NOTES: I made note of some things that didn't make sense to me in bold'''

			'''Also, picture?'''

			<onlyinclude>A '''photon''' is a particle of [[light]] which essentially is a packet of [[electromagnetic radiation]].</onlyinclude> The [[energy]] of the photon depends on its [[frequency]] (how fast the [[electric field]] and [[magnetic field]] wiggle, '''this needs better wording, for 'fast electric field' and 'wiggle''''). The higher the frequency, the more energy the photon has. Of course, a beam of light has many photons. This means that really intense ''red light'' (lots of photons, with slightly lower energy) can carry more [[power]] to a given area than less intense ''blue light'' (fewer photons with higher energy).

	The [[speed of light]] (''c'') in a [[vacuum]] is constant. This means more energetic (high frequency) photons like [[X-ray]]s and [[gamma decay\|gamma ray]]s travel at exactly the same [[speed]] as lower energy (low frequency) photons, like those in the [[infrared]]. As the frequency of a photon goes up, the [[wavelength]] (<math>\lambda</math>) goes down, and as the frequency goes down, the wavelength increases. The equation that relates these three quantities for photons is: <math>c = \lambda f</math>.		The [[speed of light]] (''c'') in a [[vacuum]] is constant. This means more energetic (high frequency) photons like [[X-ray]]s and [[gamma decay\|gamma ray]]s travel at exactly the same [[speed]] as lower energy (low frequency) photons, like those in the [[infrared]]. As the frequency of a photon goes up, the [[wavelength]] (<math>\lambda</math>) goes down, and as the frequency goes down, the wavelength increases. The equation that relates these three quantities for photons is: <math>c = \lambda f</math>.

Jmdonev at 21:29, 18 May 2018

2018-05-18T21:29:21Z

← Older revision		Revision as of 21:29, 18 May 2018
Line 1:		Line 1:
	[[Category:Done 2018-05-18]]		[[Category:Done 2018-05-18]]
	<onlyinclude>A '''photon''' is a particle of [[light]] which essentially is a packet of [[electromagnetic radiation]].</onlyinclude> The [[energy]] of the photon depends on its [[frequency]] (how fast the [[electric field]] and [[magnetic field]] wiggle~~, '''this needs better wording, for 'fast electric field' and 'wiggle''''~~). The higher the frequency, the more energy the photon has. Of course, a beam of light has many photons. This means that really intense ''red light'' (lots of photons, with slightly lower energy) can carry more [[power]] to a given area than less intense ''blue light'' (fewer photons with higher energy).		<onlyinclude>A '''photon''' is a particle of [[light]] which essentially is a packet of [[electromagnetic radiation]].</onlyinclude> The [[energy]] of the photon depends on its [[frequency]] (how fast the [[electric field]] and [[magnetic field]] wiggle). The higher the frequency, the more energy the photon has. Of course, a beam of light has many photons. This means that really intense ''red light'' (lots of photons, with slightly lower energy) can carry more [[power]] to a given area than less intense ''blue light'' (fewer photons with higher energy).

	The [[speed of light]] (''c'') in a [[vacuum]] is constant. This means more energetic (high frequency) photons like [[X-ray]]s and [[gamma decay\|gamma ray]]s travel at exactly the same [[speed]] as lower energy (low frequency) photons, like those in the [[infrared]]. As the frequency of a photon goes up, the [[wavelength]] (<math>\lambda</math>) goes down, and as the frequency goes down, the wavelength increases. The equation that relates these three quantities for photons is: <math>c = \lambda f</math>.		The [[speed of light]] (''c'') in a [[vacuum]] is constant. This means more energetic (high frequency) photons like [[X-ray]]s and [[gamma decay\|gamma ray]]s travel at exactly the same [[speed]] as lower energy (low frequency) photons, like those in the [[infrared]]. As the frequency of a photon goes up, the [[wavelength]] (<math>\lambda</math>) goes down, and as the frequency goes down, the wavelength increases. The equation that relates these three quantities for photons is: <math>c = \lambda f</math>.

Jmdonev at 21:28, 18 May 2018

2018-05-18T21:28:41Z

← Older revision		Revision as of 21:28, 18 May 2018
Line 1:		Line 1:
	[[Category:Done ~~2015~~-08-21]]		[[Category:Done 2018-05-18]]
	<onlyinclude>A '''photon''' is a particle of [[light]], a packet of [[electromagnetic radiation]].</onlyinclude> The [[energy]] of the photon depends on its [[frequency]] (how fast the [[electric field]] and [[magnetic field]] wiggle). The higher the frequency, the more energy the photon has. Of course, a beam of light has ~~many,~~ many photons. This means that really intense red light (lots of photons, with slightly lower energy) can carry more [[power]] to a given area than less intense blue light (fewer photons with higher energy).		<onlyinclude>A '''photon''' is a particle of [[light]] which essentially is a packet of [[electromagnetic radiation]].</onlyinclude> The [[energy]] of the photon depends on its [[frequency]] (how fast the [[electric field]] and [[magnetic field]] wiggle, '''this needs better wording, for 'fast electric field' and 'wiggle''''). The higher the frequency, the more energy the photon has. Of course, a beam of light has many photons. This means that really intense ''red light'' (lots of photons, with slightly lower energy) can carry more [[power]] to a given area than less intense ''blue light'' (fewer photons with higher energy).

	The [[speed of light]] (''c'') in a [[vacuum]] is constant. This means more energetic (high frequency) photons like [[X-ray]]s and [[gamma decay\|gamma ray]]s travel at exactly the same [[speed]] as lower energy (low frequency) photons, like those in the [[infrared]]. As the frequency of a photon goes up, the [[wavelength]] (<m>\lambda</m>) goes down, and as the frequency goes down, the wavelength increases. The equation that relates these three quantities for photons: <m>c = \lambda f</m>.		The [[speed of light]] (''c'') in a [[vacuum]] is constant. This means more energetic (high frequency) photons like [[X-ray]]s and [[gamma decay\|gamma ray]]s travel at exactly the same [[speed]] as lower energy (low frequency) photons, like those in the [[infrared]]. As the frequency of a photon goes up, the [[wavelength]] (<math>\lambda</math>) goes down, and as the frequency goes down, the wavelength increases. The equation that relates these three quantities for photons is: <math>c = \lambda f</math>.

	Because wavelength and frequency are determined by each other, the equation for the energy contained in a photon can be written in two different ways:		Because wavelength and frequency are determined by each other, the equation for the energy contained in a photon can be written in two different ways:

	<m>E = hf</m> or <m>E = \frac{hc}{ \lambda}</m>		<math>E = hf</math> or <math>E = \frac{hc}{ \lambda}</math>

	*<m>E</m> = energy of the photon		*<math>E</math> = energy of the photon
	*<m>h</m> = the [[Planck's constant]] (6.62606957(29)×10<sup>-34</sup> [[joule\|J]]·[[second\|s]] )		*<math>h</math> = the [[Planck's constant]] (6.62606957(29)×10<sup>-34</sup> [[joule\|J]]·[[second\|s]] )
	*<m>f</m> = photon frequency		*<math>f</math> = photon frequency
	*<m>\lambda</m> = photon wavelength		*<math>\lambda</math> = photon wavelength
	*<m>c</m> = speed of light		*<math>c</math> = speed of light

	One of the strangest discoveries of [[quantum mechanics]] is that light and other small particles, like photons, are either [http://hyperphysics.phy-astr.gsu.edu/hbase/mod1.html#c1 waves or particles] depending on the experiment that measures them. When light passes through a prism they spread out according to wavelength.		One of the strangest discoveries of [[quantum mechanics]] is that light and other small particles, like photons, are either [http://hyperphysics.phy-astr.gsu.edu/hbase/mod1.html#c1 waves or particles] depending on the experiment that measures them. When light passes through a prism they spread out according to wavelength.

	~~Bombard~~ metal with light, and it displays a particle side of its nature, where only photons that have more than a specific amount of energy release [[electron]]s.		Contrarily, bombard metal with light, and it displays a particle side of its nature, where only photons that have more than a specific amount of energy release [[electron]]s.

	This experiment, called the [http://hyperphysics.phy-astr.gsu.edu/hbase/mod1.html#c2 photoelectric effect], is what won [http://www.nobelprize.org/nobel_prizes/physics/laureates/1921/ Einstein his Nobel Prize]. Photons with insufficient energy can hit metal, yet won't knock any electrons loose. Photons that exceed a threshold energy usually do knock the electrons loose, however as the photon's energy becomes much greater than necessary the ~~likelyhood~~ that it ~~does eject~~ an electron diminishes. Thus a low total energy beam of violet light might eject electrons from a particular metal, where a high energy red beam fails to eject one. Since each photon in the red beam is lower energy, there are many more of them. This ~~effect was part of~~ what led to the quantum revolution in physics. Classical physics, and intuition, both wrongly conclude that the total energy of the beam would be the most important factor in ejecting electrons.		This experiment, called the [http://hyperphysics.phy-astr.gsu.edu/hbase/mod1.html#c2 photoelectric effect], is what won [http://www.nobelprize.org/nobel_prizes/physics/laureates/1921/ Einstein his Nobel Prize]. Photons with insufficient energy can hit metal, yet won't knock any electrons loose. Photons that exceed a threshold energy usually do knock the electrons loose, however, as the photon's energy becomes much greater than necessary the likelihood that it ejects an electron diminishes. Thus a low total energy beam of violet light might eject electrons from a particular metal, where a high energy red beam fails to eject one. Since each photon in the red beam has lower energy, there are many more of them. This discovery is what led to the quantum revolution in physics. Classical physics and intuition both wrongly conclude that the total energy of the beam would be the most important factor in ejecting electrons.

	This phenomenon is important for the physics of ~~the~~ [[photovoltaic cell]]s.		This phenomenon is important for the physics of [[photovoltaic cell]]s.

	To learn more about photons please visit [http://hyperphysics.phy-astr.gsu.edu/hbase/particles/expar.html#c5 hyperphysics photons] and [http://hyperphysics.phy-astr.gsu.edu/hbase/mod2.html#c5 hyperphysics the quanta of light].		To learn more about photons please visit [http://hyperphysics.phy-astr.gsu.edu/hbase/particles/expar.html#c5 hyperphysics photons] and [http://hyperphysics.phy-astr.gsu.edu/hbase/mod2.html#c5 hyperphysics the quanta of light].
	[[Category:Uploaded]]		[[Category:Uploaded]]

J.williams: 1 revision imported

2015-08-26T21:31:30Z

1 revision imported

← Older revision	Revision as of 21:31, 26 August 2015
(No difference)

Jmdonev at 22:52, 19 August 2015

2015-08-19T22:52:22Z

New page

[[Category:Done 2015-08-21]]
<onlyinclude>A '''photon''' is a particle of [[light]], a packet of [[electromagnetic radiation]].</onlyinclude> The [[energy]] of the photon depends on its [[frequency]] (how fast the [[electric field]] and [[magnetic field]] wiggle). The higher the frequency, the more energy the photon has. Of course, a beam of light has many, many photons. This means that really intense red light (lots of photons, with slightly lower energy) can carry more [[power]] to a given area than less intense blue light (fewer photons with higher energy).

The [[speed of light]] (''c'') in a [[vacuum]] is constant. This means more energetic (high frequency) photons like [[X-ray]]s and [[gamma decay|gamma ray]]s travel at exactly the same [[speed]] as lower energy (low frequency) photons, like those in the [[infrared]]. As the frequency of a photon goes up, the [[wavelength]] (<m>\lambda</m>) goes down, and as the frequency goes down, the wavelength increases. The equation that relates these three quantities for photons: <m>c = \lambda f</m>.

Because wavelength and frequency are determined by each other, the equation for the energy contained in a photon can be written in two different ways:

<m>E = hf</m> or <m>E = \frac{hc}{ \lambda}</m>

*<m>E</m> = energy of the photon
*<m>h</m> = the [[Planck's constant]] (6.62606957(29)×10<sup>-34</sup> [[joule|J]]·[[second|s]] )
*<m>f</m> = photon frequency
*<m>\lambda</m> = photon wavelength
*<m>c</m> = speed of light

One of the strangest discoveries of [[quantum mechanics]] is that light and other small particles, like photons, are either [http://hyperphysics.phy-astr.gsu.edu/hbase/mod1.html#c1 waves or particles] depending on the experiment that measures them. When light passes through a prism they spread out according to wavelength.

Bombard metal with light, and it displays a particle side of its nature, where only photons that have more than a specific amount of energy release [[electron]]s.

This experiment, called the [http://hyperphysics.phy-astr.gsu.edu/hbase/mod1.html#c2 photoelectric effect], is what won [http://www.nobelprize.org/nobel_prizes/physics/laureates/1921/ Einstein his Nobel Prize]. Photons with insufficient energy can hit metal, yet won't knock any electrons loose. Photons that exceed a threshold energy usually do knock the electrons loose, however as the photon's energy becomes much greater than necessary the likelyhood that it does eject an electron diminishes. Thus a low total energy beam of violet light might eject electrons from a particular metal, where a high energy red beam fails to eject one. Since each photon in the red beam is lower energy, there are many more of them. This effect was part of what led to the quantum revolution in physics. Classical physics, and intuition, both wrongly conclude that the total energy of the beam would be the most important factor in ejecting electrons.

This phenomenon is important for the physics of the [[photovoltaic cell]]s.

To learn more about photons please visit [http://hyperphysics.phy-astr.gsu.edu/hbase/particles/expar.html#c5 hyperphysics photons] and [http://hyperphysics.phy-astr.gsu.edu/hbase/mod2.html#c5 hyperphysics the quanta of light].
[[Category:Uploaded]]