this post was submitted on 18 Oct 2023
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Thanks mate.
The meme confuses two things in quantum mechanics. One is the double slit experiment, which confirms that light behaves both as a wave and a particle. That's what the meme is showing here.
However it's also throwing in Schrodinger's, which states that until you look at something it exists in all states - the classic theoretical example being the cat in a box, which is both alive and dead until you open the box. That doesn't make much sense in the real world, but when looking at quantum particles it is provably true.
Here is another meme that more accurately explains things: https://mander.xyz/post/5143468
Just to complete the set of "principles of quantum mechanics that people know of but don't fully understand", there's the Heisenberg Uncertainty Principle, which states that you can either know the position of something or its momentum (ie where it's going). The more accurately you measure one of these, the less accurate any measurement is of the other.
Edit: However there's also what /u/[email protected] said below:
So maybe the meme was referring to this variation on the double slit experiment, rather than Schrodinger.