In the double-slit experiment, a single electron fired at a wall with two slits passes through both slits simultaneously, creating an interference wave pattern on the other side; however, when a detector is placed to observe which slit the electron passes through, the wave pattern collapses and the electron behaves as if it went through only one slit, demonstrating that quantum particles exist in superposition until observed.
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The Double-Slit Experiment Explained in 23 SecondsAdded:
If you fired a single electron at a wall with two slits, most people would expect it to go through one or the other. But, that's not what happens. You see, the electron goes through both slits at the same time, creating a wave pattern on the other side. But, the moment you place a detector to watch it, the pattern vanishes. It picks one slit, as if reality only exists when someone's looking.
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