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How does the electron make a photon in an antenna?
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raspberrypi:

--- Quote from: switchedmodepsu on February 07, 2017, 05:04:10 am ---
--- Quote from: raspberrypi on February 07, 2017, 04:56:41 am ---We know how an electron makes a photon in an LED. It jump from a higher orbital to a lower one emitting a photon. But in an antenna its occupying the same valance just with a different nucleus each hop.  How is the energy transferred to a radio frequency photon?

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I like that you think deeper than the average person. LIKE!  :-+  :-+  :-+

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Yea I try to think of EVERYTHING in terms of quantum physics. When I look at plastic I don't see an amorphous blob, I picture the hydrocarbon chain it makes. I ran a business and was good at seeing out of the box solutions that other couldn't. The phrase I hear alot around people is "Just ask Dave he will know." I don't think people have a personality, its just the manifestation of chemical reactions in your brain, ultimately decided down to quantum uncertainty. 
CatalinaWOW:
There is no one way to look at it.  One thing that may make it a little easier to adjust to is by computing the RF photon energy, in eV or whatever unit works best for you.  You will find that each RF photon carries a tiny, tiny amount of energy.  Comparing that energy to the thermal energy variations in the valence electrons should give some insight into why the processes seem so different.

It is difficult to detect single optical photons, it is thousands to millions of times harder to detect single RF photons.  So you have to observe the bulk effects as described by Maxwell.

rrinker:

--- Quote from: bson on February 08, 2017, 04:23:52 am ---One of the classic Feynman lectures had a nice discussion of how magnetic fields and induction are required to preserve angular momentum... But I'll be damned if I can find the passage right now.  Anyone who hasn't seem these classic B&W lectures, absolutely should - the guy was a fantastic speaker.  Here's a collection of passages relating to the scientific method from the same talks... just brilliant. 

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 I didn't hit the one you were referring to yet, but thanks for sending me down THAT rabbit hole  :-DD  Instead of going to bed I've been playing one after the other - there are 3 or 4 of the older ones like that that come up as related after each one, plus some of the more recent ones. Very easy to get sucked in and just keep hitting play on the next one.

raspberrypi:
My understanding is this.
EMF is caused by real photons; they flow out of the radiator
Electric fields are caused by virtual photons, hence why things need to be touching (picometers distance) to interact
But magnetic fields are caused by what? In veritasiums video he explains how its special relativity due to perceived motion that causes a magnetic field becuause its just an electric field, but photons are real particles but are not emitted by magnets. If the gauge boson for magnetism is the photon where are the photons in a magnet? Virtual photons don't make sense on a macroscopic scale.
HP-ILnerd:
A photon is an excitation in the electromagnetic field--just like any other particle is an excitation in its corresponding field.  It may not be a bad analogy to think of virtuals becoming real as similar to a signal going high in a Schmitt Trigger.  Any field can do it's thing without real particles being generated (E.g., the Higgs Field) because the Universe is a jittery place, but it takes energy to make a particle instantiate.  The vacuum, as an interacting set of fields, is sort of a blank canvas that has to be able to become anything that can be in it.

NB: The field notion (unsurprisingly) may seem reminiscent of the Luminiferous Aether concept.  The main (important!) difference is the fields in modern theory are all frameless:  you cannot measure your velocity relative to the fields as they all look the same regardless of your motion through them.
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