On May 16, 4:41*pm, "Szczepan Bia³ek" wrote:
U¿ytkownik "Szczepan Bialek" napisa³ w trada.pl...





"K1TTT" wrote
....
On May 9, 10:30 am, "Szczepan Bialek" wrote:
"tom"
se.net...

On 5/8/2010 2:04 PM, Szczepan Bialek wrote:

Yes. But one end of the dipole may have the better conditions to
propagate.

if it only moves in one direction as it would have
to in a monopole there is no wave only a simple field.

I am writing about a dipole with one end visible and the second
shielded.

In nature is always as you wrote. The both ands are always "visible".

Light is always directional. Radio waves can be omnidirectional.
Of course light is emitted by many dipoles. Radio waves by halve, one,
two
(circular polarity) or many (phase radar).
S*

Astonishing understanding of the subject.

Light is not coherent. So dipole radiate for very short time.
Radio waves are coherent and can be from one source. It is easy to
analyse
them.
Are they transversal?
S*

light can be coherent, what do you think lasers are?

"The most monochromatic sources are usually lasers; such high
monochromaticity implies long coherence lengths (up to hundreds of
meters). For example, a stabilized helium-neon laser can produce light
with coherence lengths in excess of 5 m. Not all lasers are monochromatic,
however (e.g. for a mode-locked Ti-sapphire laser, ?? ? 2 nm - 70 nm).
LEDs are characterized by ?? ? 50 nm, and tungsten filament lights exhibit
?? ? 600 nm, so these sources have shorter coherence times than the most
monochromatic lasers". From:
http://en.wikipedia.org/wiki/Coherence_(physics)

Up to now light is not coherent. But in future who knows.

"As the electrons are undergoing acceleration they radiate electromagnetic
energy in their flight direction, and as they interact with the light
already emitted, photons along its line are emitted in phase, resulting in a
"laser-like" monocromatic and coherent beam. The mirrors show in the sketch
below are superfluous, as all the light is emitted in one direction anyway."
From:http://en.wikipedia.org/wiki/Halbach_array

So we have the light like the radio waves: Monocromatic and coherent. But it
is not from plain lasers.
*S*

nothing is perfect. even radio waves are not perfectly monochromatic
and hence not perfectly coherent either. but they are close enough
that we can tell they are the same phenomenon, they are all
electromagnetic waves and obey the same laws.

"K1TTT" wrote
...
On May 16, 4:41 pm, "Szczepan Bia³ek" wrote:


"As the electrons are undergoing acceleration they radiate
electromagnetic
energy in their flight direction, and as they interact with the light
already emitted, photons along its line are emitted in phase, resulting in
a
"laser-like" monocromatic and coherent beam. The mirrors show in the
sketch
below are superfluous, as all the light is emitted in one direction
anyway."
From:http://en.wikipedia.org/wiki/Halbach_array

So we have the light like the radio waves: Monocromatic and coherent. But
it
is not from plain lasers.
S*

nothing is perfect. even radio waves are not perfectly monochromatic
and hence not perfectly coherent either. but they are close enough
that we can tell they are the same phenomenon, they are all
electromagnetic waves and obey the same laws.

Nobody know what the EM waves are. See what Maxwell wrote: "I propose now
to examine magnetic phenomena from a mecha nical point of view, and to
determine what tensions in, or motions of, a medium are capable of producing
the mechanical pheno mena observed. If, by the same hypothesis, we can
connect the phenomena of magnetic attraction with electromagnetic phe nomena
and with those of induced currents, we shall have found a theory which, if
not true, can only be proved to be erroneous by experiments which will
greatly enlarge our knowledge of this part of physics. " From:
http://en.wikisource.org/wiki/On_Phy...Lines_of_Force

Our knowledge is enlarged enough to say:
Now we can tell that light. radio waves and sound are the same phenomenon
and obey the same laws.
S*