The question of exactly how that happens constitutes the measurement problem of quantum mechanics.
It also suggests that the act of observing, of measuring, a quantum system has a profound effect on the system. That's the famous wave particle duality of quantum mechanics. What does the experiment tell us? It suggests that what we call "particles", such as electrons, somehow combine characteristics of particles and characteristics of waves. It's as if they knew they were being spied on and decided not to be caught in the act of performing weird quantum shenanigans. Looking makes sure that the electrons travel like well-behaved Particle pattern of two strips, as seen in the first picture above! The interference pattern disappears. You do that, then the pattern on the detector screen turns into the To find out, you might place a detector by the slits, to see which Interferes with itself, and then recombines to meet the second screen as a single, localised particle? Strangely, each individual electron contributes one dot to an overall pattern that looks like the interference pattern of a wave.īe that each electrons somehow splits, passes through both slits at once, Remains even when you fire the electrons one by one, so that they have One possibility might be that the electrons somehow interfere with each other, so they don't arrive in the same places they would if they were alone.
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