About EMR (kst)

IMHO, we should examine the basic circumstances
needed for photon emission (aka EMR), independant
of the frequency, which Doppler can adjust anyway.

In Purcell's EM on pg 11, describes "Energy of a
System of Charges", he calls "electrical potential
energy", wherein the simplest case uses two charges,

Work = q1*q2/R12 = P

and then sums to assemblies.

A photon derives energy from the "electrical potential
energy of a system" so P becomes...

P => p + energy(photon)

where

p = q1*q2/r12

and p < P.

The point I'll stress, photons (EMR) require a relative
change in the relation of q1 and q2 for emission.
An example is the relative change in an electron orbital,
w.r.t the nucleus.

Maxwell's famous "displacement current" given by
the partial &E/&t really requires a charge "q1" to be
detected, like,

q1*&E/&t = &(q1*E) /&t = &F/&t .

But to complete the dipole the source of E should
use charge "q2", where q1 and q2 are different and
separate by some length R12=ct.

Using Force*distance = energy "P" gives,

P = F*R12

so that,

&P/&R12 = F

which means the emission or detection of EMR
is relative, ie a single charge can't radiate and
therefore can't be affected by radiation.

My 3.1415 cents
Ken S. Tucker

.

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