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Written by CEDunn on 2025-01-19 at 06:22

@dlakelan

The reason this bunch of experiments shows up in QM classes is to demonstrate that the behavior of subatomic particles requires new physics to describe.

They are supposed to show how electrons don’t behave the way that a bunch of tiny charged spheres (or any other shape) would behave according to classical electrodynamics, and to show that, mathematically, the departure is pretty simple and can be modeled with 2-dimensional, complex, linear algebra that tracks the “quantum state” of the electrons.

You are right that if you put the beam back together, it is a new experiment, but the point is that the result is not one you would expect from classical physics.

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