-Caveat Lector-
Jim Norman wrote:
>
> -Caveat Lector-
>
> Mark McHugh wrote:
>
> > -Caveat Lector-
> >
> > Do you know how a fluorescent light bulb works, Colleen?
> >
> > An electric current is passed from one end of the tube to the other.
>
> Nope, the current is passed through a heater element on each end of the tube. The
> heater element excites the gas in the tube. The excited gas is what gives off
> light.
> Jim
>
> > The some
> > of the eletrons' energy is absorbed by the gas enclosed inside the tube and
> > reradiated by the gas atoms in a visible wavelength.
>
> Nope, again. It's a little more complicated than that.
>
Colleen originally asked for a "Mr. Wizard" style answer, so I tried to keep it
easy. It's been a few years since my last physics course.
"A fluorescent lamp consists of a gas-filled glass tube with an electrode at
each end. This lamp emits light when a current of electrons passes through
it from one electrode to the other and excites mercury atoms in the tube's
vapor. The electrons are able to leave the electrodes because those electrodes
are heated to high temperatures and an electric field, powered by the electric
company, propels them through the tube. However, the light that the mercury
atoms emit is actually in the ultraviolet, where it can't be seen. To convert
this ultraviolet light to visible light, the inside surface of the glass tube
is coated with a fluorescent powder. When this fluorescent powder is exposed
to ultraviolet light, it absorbs the light energy and reemits some of it as
visible light, a process called "fluorescence." The missing light energy is
converted to thermal energy, making the tube slightly hot."
This info is from Physic prof Louis Bloomfield's page, How Things Work, found at
http://howthingswork.virginia.edu/
> >
> >
> > Energy is coming off your antennae,
>
> I thought this was a reception antennae. Antennae that receive do not create any
> RF energy by its self. They must be connected to a RF transmitter. You may hold
> a fluorescent light next to the antennae of a RF transmitter and when that
> transmitter is keyed, you will see the fluorescent light glow.
>
> > exciting the halogen and producing the
> > familiar glow.
>
> halogen requires more heat than a fluorescent light to cause light emission. I
> have never experimented with Halogen, but I'll bet it would require RF energy as
> well to cause it to give off light.
> Jim
A halogen bulb is incandescent, therefore it's light is produced by the the
glowing tungsten filament. The halogen just prolongs the life of the filament.
I wonder which of the halogenous gasses are used and if any of them could be
caused to glow.
Sorry about the incorrect info on the antenna question. I was thinking of an
antenna for a radio freq transceiver. I always remember our sergeants wanting
us to grab the PRC's antenna when they keyed the mike. Our jammer's antennae
were to be avoided at all costs!
I suggest avoiding contact with your antenna and seeking professional help. ;)
--
Mark McHugh
Blinded by science
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