Re: Waves

Der alte Hexenmeister a écrit :
"srp" <srp2@xxxxxxxxxxxxxxxx> wrote in message news:43B4BBEC.7020708@xxxxxxxxxxxxxxxxxxx

Der alte Hexenmeister a écrit :

"srp" <srp2@xxxxxxxxxxxxxxxx> wrote in message news:43B455AB.805@xxxxxxxxxxxxxxxxxxx


oisin a écrit :


Before I ask my question I would like to state that both by knowledge
and understanding of physics is barely elementary. I have only studied the
subject up to secondary school level.
As I understand it, waves require "something" to travel through. 

Sound waves do, since they correspond to a motion of the supporting
material (air, water, solid matter, etc. and simply could not exist
without the supporting material.



A vacuum as I understand it, is a space from which mater is absent. So
how can waves from the electro-magnetic spectrum travel through a vacuum, 

If light really was "waves" at the fundamental level, a medium would
probably be required. But waves, or more precisely "plane waves" is
simply a mathematical treatment that accounts at the macro level (our
level) for what is happening at the sub microscopic level.



Ahem...
One can hardly call a wavelength of 3 metres "sub microscopic".
The FM band on your radio is centred at 100 MHz and roof top
antenna are that large. I doubt you have sub microscopic eyes, either.
Der alte Hexenmeister.


So you think that a visible light photon emitted by a de-energizing
electron in an atom and lower energy 100 MHz photon emitted by a
dipole can be differentiated by more than their difference in energy ?

Please tell us more. 

I didn't tell you what I thought. What I know from experience is
that people who make assumptions about what I think are invariably
incorrect.


I don't think I made any assumption. You said "One can hardly call
a wavelength of 3 meters sub microscopic".

Correct me if I'm wrong, but whichever way I look at it, that
sentence, irrespective of who issued it, given that you were
commenting on my statements that photons are discrete quantities
of energy at the sub microscopic level, implies that a photon
having that wavelength was not sub-microscopic.

You introduced the notion of wavelength, not me.

You seem to imply that the 3 m wavelength has anything to do
with the size (that you seem to assume as being "not sub
microscopic") of the related photon. If so, I would like you
to tell us more on this.

If you have a question then ask it, 

Well here it is:

In what way do you consider a photon of energy .0000004 eV
moving 3 meters in 1.0E-8 sec as not being sub microscopic ?

but do not assume I shall return your preconception of what I think. 

Fine. Same for me.

Define "photon", then we'll discuss definitions. 

I have defined it in context (in my first post in this thread)
as a discrete amount of EM energy travelling individually.

If we reach agreement then we'll proceed. 

Agreement not required. Objective reality doesn't seem to
care much about what any of us think.

André Michaud
.

Relevant Pages

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