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How does a photon have momentum (p=mv) if there is no mass? (the article has some equations, but not much explanation.)
How would a Kugelblitz (astrophysics) form if there is no photon mass? or does energy also bend space-time? (perhaps better addressed in the Kugelblitz article?
If a particle and anti-particle annihilate, how many photons does one get? Just one? or a bunch of them?
Could we say the number of photons in the universe vastly out-numbers the amount of matter particles? I think I read someplace 99% of matter in the early universe annihilated when particles met their anti-particles, presumably making a lot of photons.
A radio wave might be many meters long - how do they manage to interact with very tiny electrons? I suppose the wave is composed of innumerable photons which are of a "size" to interact? Feldercarb ( talk) 23:05, 6 October 2023 (UTC)
Do photons interact with each other? If two photons "collide" for example? Since don't follow exclusion principle I would presume nothing happens. But then we have wave interference. Obviously I am muddled.
Can an energetic photon "decay" or "transform" into several photons of lesser energy, such that the total energy remains the same? (2xE --> E + E). Or two lesser energy combine into a single more energetic one?
A bit unclear where both electric and magnetic components of an EM wave arise. Single photon carries or mediates both? Or there are "E" photons and "M" photons. As pointed out above, I suppose sometimes the wave model work for some things, photon model for others? Feldercarb ( talk) 23:05, 6 October 2023 (UTC)
Under the heading 'annihilation' it would be useful to explain when four or six (or 2n) photons would be produced. The received wisdom seems to invariably prefer 'two', but in 3-dimensional space, six - mutually at rightangles - seems an obvious choice. If there were four they'd need to be in the same plane, but we'd then need to address the question of what their polarization and the angle of that plane should be; (if we were really struggling we'd no doubt dismiss that as 'random'). Also, traditionally photons don't interact in the absence of an electric charge but I understand that exceptionally they can, usually if one is a very high energy ɤ and the other of much lower energy. Assuming that this is the case, it might be helpful to confirm that. It might also be useful to explain when axions can be produced (if such esoteric items exist!). Paul Renshaw ( talk) 15:16, 2 November 2023 (UTC)
An article describing photons should mention that in addition to Spin Angular Momentum, photons also have Orbital Angular Momentum 50.38.13.172 ( talk) 03:35, 19 November 2023 (UTC)
This is the
talk page for discussing improvements to the
Photon article. This is not a forum for general discussion of the article's subject. |
Article policies
|
Find sources: Google ( books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL |
Archives: 1, 2, 3, 4, 5Auto-archiving period: 60 days |
Photon is a former featured article. Please see the links under Article milestones below for its original nomination page (for older articles, check the nomination archive) and why it was removed. | |||||||||||||||||||||||||
This article appeared on Wikipedia's Main Page as Today's featured article on October 14, 2006. | |||||||||||||||||||||||||
|
This
level-3 vital article is rated B-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||
|
|
This page has archives. Sections older than 60 days may be automatically archived by Lowercase sigmabot III when more than 3 sections are present. |
How does a photon have momentum (p=mv) if there is no mass? (the article has some equations, but not much explanation.)
How would a Kugelblitz (astrophysics) form if there is no photon mass? or does energy also bend space-time? (perhaps better addressed in the Kugelblitz article?
If a particle and anti-particle annihilate, how many photons does one get? Just one? or a bunch of them?
Could we say the number of photons in the universe vastly out-numbers the amount of matter particles? I think I read someplace 99% of matter in the early universe annihilated when particles met their anti-particles, presumably making a lot of photons.
A radio wave might be many meters long - how do they manage to interact with very tiny electrons? I suppose the wave is composed of innumerable photons which are of a "size" to interact? Feldercarb ( talk) 23:05, 6 October 2023 (UTC)
Do photons interact with each other? If two photons "collide" for example? Since don't follow exclusion principle I would presume nothing happens. But then we have wave interference. Obviously I am muddled.
Can an energetic photon "decay" or "transform" into several photons of lesser energy, such that the total energy remains the same? (2xE --> E + E). Or two lesser energy combine into a single more energetic one?
A bit unclear where both electric and magnetic components of an EM wave arise. Single photon carries or mediates both? Or there are "E" photons and "M" photons. As pointed out above, I suppose sometimes the wave model work for some things, photon model for others? Feldercarb ( talk) 23:05, 6 October 2023 (UTC)
Under the heading 'annihilation' it would be useful to explain when four or six (or 2n) photons would be produced. The received wisdom seems to invariably prefer 'two', but in 3-dimensional space, six - mutually at rightangles - seems an obvious choice. If there were four they'd need to be in the same plane, but we'd then need to address the question of what their polarization and the angle of that plane should be; (if we were really struggling we'd no doubt dismiss that as 'random'). Also, traditionally photons don't interact in the absence of an electric charge but I understand that exceptionally they can, usually if one is a very high energy ɤ and the other of much lower energy. Assuming that this is the case, it might be helpful to confirm that. It might also be useful to explain when axions can be produced (if such esoteric items exist!). Paul Renshaw ( talk) 15:16, 2 November 2023 (UTC)
An article describing photons should mention that in addition to Spin Angular Momentum, photons also have Orbital Angular Momentum 50.38.13.172 ( talk) 03:35, 19 November 2023 (UTC)