Re: Anyone know the distance between the two slits?

On Tue, 04 Sep 2007 13:08:26 +0000, Chris wrote:

At least 1000 light years to be sure. Try a radio galaxy behind another
galaxy of 10,000 light years across the interference is there as it can
only occur as one photon interferes with itself, in reality it is like
shrodinger and matter waves.

god moves in mysterious ways.

Electrons are the same, the slits can be ten meters apart. It is "the
electron can only go through one slit so how does it interfere with
itself.

If you watch the pattern builds up as a series of flash dot by dot and
this is the same for photons.

so what is happening. you just take it as "observed" you cannot imagine
a mechanism.

E=1/2mv^2 + mc^2 E=hf

cf=L

so the diffraction pattern is the result of the path length from each
slit being additional + or canceling - the amplitude is called the
error function.

When all paths are roughly the same length, the pattern formed -- whether
"diffraction" or "interference" -- is actually a plot of the intensity of
the 2-dimensional Fourier transform of the "window" through which the
source is being viewed, whether the "window" is a pinhole, a slit, two
slits, a bunch of slits, an anulus (perhaps with the center hidden by a
secondary mirror or a distant galaxy), or what-have-you.

A very simple but helpful model is to imagine that the the "window" is
filled with point sources, each emitting waves; the pattern is formed as
a result of the interference of these "sources". Watching water waves in
a ripple tank can help with picturing this. (If you haven't got a ripple
tank, find a pond next to a hill. Stand on the hill, throw some pebbles
into the pond, and watch the ripples when the rings from multiple pebbles
cross... it can be enlightening, but in any case it's relaxing, whether
or not you learn anything from it.)

If some paths are vastly longer than others, then at least in everyday
water waves you need to take account of the falloff in intensity with
path length and it's not a simple Fourier transform anymore; I expect the
same is true of probability waves and light waves but I'm not sure.


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