Re: physical principle responsible for EMwave propagation
- From: John C. Polasek <jpolasek@xxxxxxxxxx>
- Date: Sun, 15 Jul 2007 17:49:26 -0400
On Sun, 15 Jul 2007 07:55:06 -0700, srp@xxxxxxxxxxxx wrote:
On 12 juil, 08:31, Rudolf Drabek <newsr...@xxxxxx> wrote:
This is no joke, I ask for help.
Maxwell's theory is wellknown and describes all the math.
relationships of EM waves.
To date I never had the idea to ask for the physical principle behind.
I know and accept the induction principles that charges are the cause
for EM fields.
The vacuum has c, e_o and my_o, but where are the propagating charges?
Would be nice to get really a serious answer of my request.
By definition e_0 (eps_0) is a unit of capacitance per meter of
vacuum and mu_0 is a unit of inductance per meter of vacuum
Both of these are associated when full treatment of em
waves is done. The Poynting vector is a reflection of this
association.
Capacitance implies displacement current, which in turn
implies charges. But it is true that in wave treatment,
there seems to be no traces of charges being associated.
On the other hand, it is known since Planck that light
does not really propagate as a wave despite the usefulness
of wave treatment, but as quantized quantities (photons)
Presumably, when the internal dynamic structure
of individual photons is better understood, we may
finally discover the apparently missing charges.
André Michaud
I have the impression that all light comes from quantized transitions
in the atom, so that each such transition is possessed of some exact
energy E = h*nu = h*c/L? It thereupon transmits as a wave in
pair-space or equivalent with wavelength L.
A close analog is dropping a pebble that has energy E = mgh into a
tranquil pond and watching that energy radiate as waves.It seems clear
the waves must possess energy E, but idt would be a stretch to claim
that E travels as a photonlike particle, just because it's quantized.
The missing charges are the virtual pairs in pair-space.
John Polasek
.
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