"tom" wrote
. net...
On 10/18/2010 11:46 AM, Szczepan Bialek wrote:
"Cecil wrote
...
On Oct 18, 2:44 am, "Szczepan wrote:
Photons are the math joke.

:-) ... he says as photons impacting his retina allow him to read the
postings and see his keyboard.

Light is not coherent. It is "produced" in the packets (photons). But the
radio waves and the radiation from the "free electron laser" are
coherent.
When the photons start and when finish?
S*

Where did Cecil mention "coherence"?

Photons and incoherence are the same. "In 1900, Max Planck was working on
black-body radiation and suggested that the energy in electromagnetic waves
could only be released in "packets" of energy".

In a black body is many dipoles which work with brakes. In radio a dipole
(or monopole) works continously.
S*