Timeline for Sequence of E and B field in radio waves and in single photons
Current License: CC BY-SA 3.0
8 events
| when toggle format | what | by | license | comment | |
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| Aug 25, 2014 at 18:16 | history | edited | Per Arve | CC BY-SA 3.0 |
added 501 characters in body
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| Aug 21, 2014 at 18:23 | comment | added | Per Arve | @HolgerFiedler Oh, I thought you ment the two first sentences of my answer. I cannot understand well enough what you wrote in your question to discuss it such detail. My point was actually that photon theory describes both far field and near field. In the latter case the photons are virtual. | |
| Aug 21, 2014 at 17:48 | comment | added | HolgerFiedler | We agree that the two first sentences are right. What is about the third sentence about the two possible shifts of +90° and -90° of one of the fields to the other? See this and that picture. | |
| Aug 21, 2014 at 17:29 | comment | added | Per Arve | @HolgerFiedler Yes, a single photon is the first excited state of a normal mode oscillator of the electromagnetic fields.(F.Mandl, G.Shaw, Quantum Field Theory, John Wiley and Sons) Far-zone field from an antenna can be of various kinds depending on the shape of the antenna, for example electric dipole. Actually there is an infinite series of different electric and magnetic multipole patterns that are possible far-zone fields. The same multipoles are possible in photon emission, se e.g. A.Bohr, B.Mottelson, Nuclear Structure vol I. | |
| Aug 21, 2014 at 10:08 | comment | added | Per Arve | The standing wave mode tells how the individual oscillators swing together. What I tried to describe is normal mode theory. | |
| Aug 21, 2014 at 9:59 | comment | added | Per Arve | Maxwells equations in free space is just wave equations. A wave equation may be viewed as an equation for a set of coupled harmonic oscillators. Both in the classical and quantal description the same transformation will bring the system inte uncoupled harmonic oscillations. For waves in a finite volume the new coordinates will be the amplitudes of the standing waves. | |
| Aug 21, 2014 at 9:11 | comment | added | HolgerFiedler | Let us discuss the first two sentences. Are they right? | |
| Aug 21, 2014 at 8:47 | history | answered | Per Arve | CC BY-SA 3.0 |
