On 12/1/2012 12:52 PM, John Clark wrote:
Again there is nothing special about an observer in this, the same thing
happen if nobody looked at the film, or even if you used a brick wall
film, because the important thing is not that the photon makes a record
that is) but simply that it is destroyed.
> But you can do the experiment with electrons too, and the electrons are
Good point. If electrons are used in the two-split experiment a brick wall probably
wouldn't do, you'd need a metal wall. Brick is a pretty good insulator so you'd end up
with 2 small negatively charged spots on the wall in slightly different places;
How would you get two charged spots? Would each have charge -e/2? The experiment was
originally done with photographic film, so that each electron ionized a silver halide atom
resulting in a silver spot on the film. Now it's usually down is some kind of detector
that amplifies the effect of each electron. Neither one has anything to do with
destroying the electron.
the walls would not be the same and so the 2 universes would not be the same and so they
would not merge. However if it was a metal wall the electrons would just join the
general sea of free electrons in the metal and there is no way even in theory to tell
one electron from another. So the walls would have the same charge and mass.
But in an entangled electron pair experiment (EPR type) detecting the path of one electron
destroys the interference pattern on the other leg. But also just absorbing one electron
destroys the interference on the other leg. To maintain the interference you have to
absorb the electron at the focal point of a lens so that you not only don't detect the
which-way information, you erase it.
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