Øistein Wind wrote:
> Hejsa.
> Jeg er i forbindelse med kvantemekanikken og fusion/fission ofte stødt på
> begrebet tunneling, men det har aldrig været præcise beskrivelser jeg har
> mødt. Nogle der har lyst til at byde? De fleste steder står dette omtalt
> meget difust, så jeg håber der er nogen der har lyst til at udpensle det
> lidt for mig...
>
> Øistein
>
>
Hej Øistein
Det er simpelthen fordi ingen har en fornuftig fysisk forklaring på
tunneling. Døm selv:
Hvem kan vurdere om denne adresses Quantum Tunneling forsøg er rigtig?:
DIY (Do It Yourself): Quantum Tunneling on Your Kitchen Table
http://www.altair.org/Qtunnel.htm
-
July 22, 1997, The New York Times Company: Signal Travels Farther and
Faster Than Light:
http://dustbunny.physics.indiana.edu/~dzierba/HonorsF97/Week1/NYTJuly22.html
Citat: "...
Another deep quantum mystery for which physicists have no answer has
to do with "tunneling" -- the bizarre ability of particles to sometimes
penetrate impenetrable barriers. This effect is not only well
demonstrated; it is the basis of tunnel diodes and similar devices vital
to modern electronic systems.
...
Tunneling is based on the fact that quantum theory is statistical in
nature and deals with probabilities rather than specific predictions;
there is no way to know in advance when a single radioactive atom will
decay, for example.
The probabilistic nature of quantum events means that if a stream of
particles encounters an obstacle, most of the particles will be stopped
in their tracks but a few, conveyed by probability alone, will magically
appear on the other side of the barrier. The process is called
"tunneling," although the word in itself explains nothing.
Chiao's group at Berkeley
http://www.physics.berkeley.edu/research/chiao/
[
Tunneling speed
http://lal.cs.byu.edu/ketav/issue_3.2/Lumin/lumin.html#fig-4-2
/
Superluminal motion paper
http://lal.cs.byu.edu/ketav/issue_3.2/Lumin/lumin.html
]
,
Dr. Aephraim M. Steinberg at the University of Toronto
http://helios.physics.utoronto.ca/people/faculty/aephraim.html
and others are investigating the strange properties of tunneling, which
was one of the subjects explored last month by scientists attending the
Nobel Symposium on quantum physics in Sweden
http://www.nobel.se/nil/symposia/physics.html
.
"We find," Chiao said, "that a barrier placed in the path of a tunneling
particle does not slow it down. In fact, we detect particles on the
other side of the barrier that have made the trip in less time than it
would take the particle to traverse an equal distance without a barrier
-- in other words, the tunneling speed apparently greatly exceeds the
speed of light. Moreover, if you increase the thickness of the barrier
the tunneling speed increases, as high as you please.
"This is another great mystery of quantum mechanics."
..."
mvh/Glenn