| Topic: |
Science > Physics |
| User: |
"Gert Baars" |
| Date: |
08 Aug 2007 12:42:06 AM |
| Object: |
The Dual Split experiment |
With the dual slit experiment the projection
shows an interference pattern that can only
occur if light is an electromagnetic wave.
If a lens if put behind the dualslit diafragma
and focussed the projection is the one of
the two slits and the interference pattern is gone
which can only occur if light is a stream of
particles. This shows the wave-particle duality
of photons.
What will happen if instead of a lens
smoke is blown between the diafragma and
the projection. Will the light 'behave' as a wave
or as particles?
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| User: "Uncle Al" |
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| Title: Re: The Dual Split experiment |
07 Aug 2007 07:25:54 PM |
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Gert Baars wrote:
With the dual slit experiment the projection
shows an interference pattern that can only
occur if light is an electromagnetic wave.
*****.
http://www.univie.ac.at/qfp/research/matterwave/c60/index.html
C60 is more than 1.3 million times more massive than an electron,
itself possessd of vastly more linear momentum than a photon.
[snip rest of crap]
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/lajos.htm#a2
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| User: "Jim Black" |
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| Title: Re: The Dual Split experiment |
08 Aug 2007 01:03:50 AM |
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On Tue, 7 Aug 2007 22:42:06 -0700, Gert Baars wrote:
With the dual slit experiment the projection
shows an interference pattern that can only
occur if light is an electromagnetic wave.
If a lens if put behind the dualslit diafragma
and focussed the projection is the one of
the two slits and the interference pattern is gone
which can only occur if light is a stream of
particles.
This really has nothing to do with the particle nature of light. Waves
entering and exiting a lens bend because they move at different speeds in
different mediums. Lenses and mirrors can focus waves, too, although
diffraction puts a limit on how well you can do.
This shows the wave-particle duality
of photons.
What will happen if instead of a lens
smoke is blown between the diafragma and
the projection.
If the smoke doesn't simply absorb most of the light, my guess is it will
scatter the light incoherently, giving you a rapidly changing blur on the
wall. If you're lucky, you might be able to see the interference pattern
in the smoke. But don't take my word for it. With a cheap laser pointer
as a light source, you can test this and other modifications to the
double-slit experiment yourself.
Will the light 'behave' as a wave
or as particles?
To the best of our knowledge, light follows the strange rules of quantum
electrodynamics. However, for the purposes of the experiments described
above, the classical wave model is a good enough approximation.
--
Jim E. Black
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| User: "Y.Porat" |
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| Title: Re: The Dual Split experiment |
08 Aug 2007 01:40:02 AM |
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On Aug 8, 9:03 am, Jim Black <trams...@yahoo.com> wrote:
On Tue, 7 Aug 2007 22:42:06 -0700, Gert Baars wrote:
With the dual slit experiment the projection
shows an interference pattern that can only
occur if light is an electromagnetic wave.
If a lens if put behind the dualslit diafragma
and focussed the projection is the one of
the two slits and the interference pattern is gone
which can only occur if light is a stream of
particles.
This really has nothing to do with the particle nature of light. Waves
entering and exiting a lens bend because they move at different speeds in
different mediums. Lenses and mirrors can focus waves, too, although
diffraction puts a limit on how well you can do.
This shows the wave-particle duality
of photons.
What will happen if instead of a lens
smoke is blown between the diafragma and
the projection.
If the smoke doesn't simply absorb most of the light, my guess is it will
scatter the light incoherently,
------------
if it is scattering ther light
does it mean that we are* not** dealing actually
with a 'single photon'
but many of tghem ????!!!!!!
TIA
Y.Porat
----------------------
giving you a rapidly changing blur on the
wall. If you're lucky, you might be able to see the interference pattern
in the smoke. But don't take my word for it. With a cheap laser pointer
as a light source, you can test this and other modifications to the
double-slit experiment yourself.
Will the light 'behave' as a wave
or as particles?
To the best of our knowledge, light follows the strange rules of quantum
electrodynamics. However, for the purposes of the experiments described
above, the classical wave model is a good enough approximation.
--
Jim E. Black
.
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| User: "Jim Black" |
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| Title: Re: The Dual Split experiment |
08 Aug 2007 02:37:34 AM |
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On Tue, 7 Aug 2007 23:03:50 -0700, Jim Black wrote:
On Tue, 7 Aug 2007 22:42:06 -0700, Gert Baars wrote:
With the dual slit experiment the projection
shows an interference pattern that can only
occur if light is an electromagnetic wave.
If a lens if put behind the dualslit diafragma
and focussed the projection is the one of
the two slits and the interference pattern is gone
which can only occur if light is a stream of
particles.
This really has nothing to do with the particle nature of light. Waves
entering and exiting a lens bend because they move at different speeds in
different mediums. Lenses and mirrors can focus waves, too, although
diffraction puts a limit on how well you can do.
"Nothing to do with" may have been an overstatement there. All the
behaviour you described is consistent with waves, but people have done
experiments like these with only one photon in the apparatus at a time, and
obtained the same results.
This shows the wave-particle duality
of photons.
What will happen if instead of a lens
smoke is blown between the diafragma and
the projection.
If the smoke doesn't simply absorb most of the light, my guess is it will
scatter the light incoherently, giving you a rapidly changing blur on the
wall. If you're lucky, you might be able to see the interference pattern
in the smoke.
I just tried this with steam (not a single-photon experiment, just a cheap
laser pointer), and you can indeed see the interference patterns in the
steam. As for the pattern on the wall, most of the light just passed
through the steam without scattering, so the interference pattern remained.
--
Jim E. Black
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