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How does the electron make a photon in an antenna?
Rick Law:
Photon and EM wave are the same thing. To say EM wave make photons is rather like saying H2O makes water. Photon is a packet of EM wave energy. EM wave traveling is a bunch of photons traveling.
U Colorado has a decent presentation on it - any physics department lecture would do as they all study the topic:
http://www.colorado.edu/physics/EducationIssues/ModernPhysics/Lecture_Notes/CSMSP11_Lecture11_AtomicSpectra(asgiven).pdf
When energy is released in an atom, such as when an electron falls from a higher energy state to a lower energy state, it will emit a photon - that is the same as saying it will emit EM wave. That released EM wave (photon) contains the energy it released.
Mass and energy are the same thing. Photon (mass-less) carries momentum.
Photon and EM wave relationship is a different concept from wave-particle duality. Wave-particle duality is the concept that all particles exhibits wave properties and the reverse is also true. You can pick any subatomic particle, be it photon, electron, alpha particle, or for that matter, any particle. When you treat it as a particle, you can measure it's particle properties. When you treat it as a wave, you can measure its wave properties. You will find alpha particles doing crazy things like being at two places at the same time when you are treating it as a wave.
Back to photon - current theory is, all EM waves travel at c. However, there are studies pointing to possibly not all photons travel at c. U.C. Davis study on how gamma ray appears to be slower is pointing at possibly not all photons travel at c.
https://www.ucdavis.edu/news/gamma-ray-delay-may-be-sign-new-physics/
A lot of work are being done. We don't know all there is to know yet.
raspberrypi:
--- Quote from: calexanian on February 07, 2017, 09:33:27 pm ---Perhaps this thought may help. Magnetic fields can exist completely independent of a particle carrier or medium. Particles can interact with the field, but they are not necessary for it to propagate.
--- End quote ---
Every force has to have a gauge boson. Strong=gluon Weak= W and Z bosons EM= photon, and gravity = graviton (not seen ... yet). So the question here is what makes the photons for magnetic fields. Virtual photons are out because the ranges are too long, like 10^20th too long!
T3sl4co1l:
Who are you to tell a photon how far to travel? :-DD
Tim
raspberrypi:
--- Quote from: Rick Law on February 11, 2017, 04:04:51 am ---Photon and EM wave are the same thing. To say EM wave make photons is rather like saying H2O makes water. Photon is a packet of EM wave energy. EM wave traveling is a bunch of photons traveling.
When energy is released in an atom, such as when an electron falls from a higher energy state to a lower energy state, it will emit a photon - that is the same as saying it will emit EM wave. That released EM wave (photon) contains the energy it released.
Mass and energy are the same thing. Photon (mass-less) carries momentum.
Photon and EM wave relationship is a different concept from wave-particle duality. Wave-particle duality is the concept that all particles exhibits wave properties and the reverse is also true. You can pick any subatomic particle, be it photon, electron, alpha particle, or for that matter, any particle. When you treat it as a particle, you can measure it's particle properties. When you treat it as a wave, you can measure its wave properties. You will find alpha particles doing crazy things like being at two places at the same time when you are treating it as a wave.
work are being done. We don't know all there is to know yet.
--- End quote ---
OK but there must be different mechanism to radiate sub Infrared (longer) photons. When a wire generates a radiowaves no electrons are jumping from a higher orbital to a lower one as is the case to make IR light UV and Xrays (balmer series etc). The longer the jump the higer energy/shorter wave length photon. IR seems to emitted by phonons in matter as way to get rid of thermal energy. But what happens at lower energies?
Vtile:
You can create radiotion also by changing the direction of electron rapidly or by driving it faster than the speed of light (sorry for a wrong term here, but I can not get the right "relatively light speed" term to my head) in dielectric. Goes over my understanding/knowledge what you want to call it, but yep.
https://en.wikipedia.org/wiki/Synchrotron_radiation
https://en.wikipedia.org/wiki/Bremsstrahlung
https://en.wikipedia.org/wiki/Cherenkov_radiation (I like that it were predicted by heaviside, would have been interesting to go to get a beer with him.)
Those Feyman lectures, whoa. Spend 3 hours already. ::)
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