Instead, the electrons behave not as waves, but as classical particles. experiment, you don't get an interference pattern on the screen behind it. If you measure which slit an electron goes through when performing a one-at-a-time double slit. And now, at the end, when we look at our screen, this is what we see. At last, each electron has been counted, and we know which slit every one went through. With each electron that goes through, we get a signal coming from one of the two slits. When the electron goes through, the light is slightly perturbed, so we can "flag" which one of the two slits it passed through. So we set up the same experiment, but this time, we have a little light we shine across each of the two slits. Is the electron going through both slits at once, interfering with itself somehow? This seems counterintuitive and physically impossible, but we have a way to tell whether this is true or not: we can measure it. Somehow, each electron must be interfering with itself, acting fundamentally like a wave.įor many decades, physicists have puzzled and argued over what this means must really be going on. Once enough electrons are fired, the interference pattern can clearly be seen. Here, you can see the results of an experiment where electrons are fired one-at-a-time through a double-slit. images or probe particle sizes just as well as light can. Electrons exhibit wave properties as well as particle properties, and can be used to construct.
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