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Reason, as applied to the events of our ordinary macro experience, tells us that a particle must pass through one slit or the other. The experiment tells us that there must be at least two slits to produce an interference pattern, and that anything that locates the particle before it hits the screen will destroy the interference pattern. Recent experiments have tried to identify which of the two slits a particle is coming out of on its way to the detection screen. Doing so will also prevent interference.
Originally posted by Nichiren
1) Is an interference pattern by definition always caused by at least 2 particles interacting?
2) How do you shoot one very small electron through two very small slits?
3) If you only send one "unobserved" electron and then measure the impact on the screen, do you already get an interference pattern, albeit very faint, or is it just one dot?
4) I keep hearing and reading (on ATS) that the human mind, the observer/consciousness, has a fundamental impact on the experiment when we "measure" which way the particle went. Some people write that "the mind" collapses the wave-function of the particle. Is that really true or just a myth?
If the experiment were done by computer only, would the result change?
4b) Also, are we able to measure which way the particle went without disturbing the particle at all?
5) If we measure which way the electron went before it (them LOL) hits the slits we don't get an interference pattern. What happens if we measure it right AFTER it has already gone through the slits (exit poll).
6) Lastly, if you shoot one electron through the slits and you get an interference pattern would that mean that one electron turned into two?
Originally posted by masterp
I don't have a PHD, but here is my attempt:
An observer is simply a photon (or electron) emitted on purpose in order to see what's going on.
It doesn't make any difference if a human is near the emission or not.
Originally posted by buddhasystem
Originally posted by Nichiren
1) Is an interference pattern by definition always caused by at least 2 particles interacting?
By at least two waves, not particles
Originally posted by LightFantastic
Originally posted by buddhasystem
Originally posted by Nichiren
1) Is an interference pattern by definition always caused by at least 2 particles interacting?
By at least two waves, not particles
A single photon at a time through the double slits will still create the interference pattern by interfering with itself. Or is that still classed as two waves?
Originally posted by buddhasystem
a) each slit effectively becomes a source, so in a way you already have two waves
b) a single photon will be still observed locally, i.e. will leave a dot or count in a specific place on the screen, and not a pattern.