- #1
scholzie
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I have been reading lately about experiments done in the 30s and 40s regarding electron diffraction patterns. Apparently when electrons are fired through what effectively amounts to a double slit, then detected on phosphorous, they create a diffraction similar to that of coherent light. This is because, according to QM, electrons are only defined by their probability functions until there is an attempt to detect them, and these waves interfere with each other in the same way as photons might.
I am ok with all of that. What gets me is that when the electron firing rate is slowed to a mere electron every 10 seconds you still get the same pattern. What causes photon diffraction is the path difference between two photons traveling and interfering at the same time. When you slow the rate to one electron every 10 seconds, though, you no longer have interference between two probability waves at the same time, so how on Earth could they continue interfering which each other when one is detected and the other hasn't even left the emitter yet?
I have a theory about why I think it happens, and maybe I'm right; I am probably not, though. I think that perhaps, since all electrons have an infinite, but defined, probability function, the interference between any two electrons in the universe is always decided at any given point in space/time. More clearly: if you were to freeze time, and check out (impossibly) the current distribution of probabilities for every electron, assuming you could do such a thing, then you could find the level of interference between any group of electrons at any point in space. Essentially, the interference pattern between any two electrons is already determined, and you only get to see it when the electrons are detected on the phosphorous screen...
I am probably way off here, but to me it makes no sense that two waves could interfere with each other even if they're separated by 10 second intervals...can someone shed some light on this for me? (No pun intended, I swear.)
I am ok with all of that. What gets me is that when the electron firing rate is slowed to a mere electron every 10 seconds you still get the same pattern. What causes photon diffraction is the path difference between two photons traveling and interfering at the same time. When you slow the rate to one electron every 10 seconds, though, you no longer have interference between two probability waves at the same time, so how on Earth could they continue interfering which each other when one is detected and the other hasn't even left the emitter yet?
I have a theory about why I think it happens, and maybe I'm right; I am probably not, though. I think that perhaps, since all electrons have an infinite, but defined, probability function, the interference between any two electrons in the universe is always decided at any given point in space/time. More clearly: if you were to freeze time, and check out (impossibly) the current distribution of probabilities for every electron, assuming you could do such a thing, then you could find the level of interference between any group of electrons at any point in space. Essentially, the interference pattern between any two electrons is already determined, and you only get to see it when the electrons are detected on the phosphorous screen...
I am probably way off here, but to me it makes no sense that two waves could interfere with each other even if they're separated by 10 second intervals...can someone shed some light on this for me? (No pun intended, I swear.)