Comments by "Dr Gamma D" (@DrDeuteron) on "Heisenberg's Uncertainty Principle Explained" video.

  1. the problem is that this phenomenon is classical, which is why it's easy to understand..as classical physics can be understood.
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  2. If you want to understand HUP, you have to understand why momentum is -ihd/dx, because of course a (complex) function can't have a precise location and a precise derivative at the same time. So why is the spatial rate of change of phase (modulated by a probability envelope) the same as momentum? Figure that out, and HUP is cake.
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  3. what you're saying is that p=hk, where k is the very classical wave vector projected into x. The "h"'s cancel, and no h means no quantum. A classical relationship.
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  4. Since (dx)(dp)>h/4pi, you'd think this is about quantum mechanics...but what is p? p=h/lambda, where lambda is the wavelength projected in the transverse direction. So what you are saying is (dx)/(dlambda)>1/2.. Note that Planck's constant is gone. No "h", no quantum. Now divide by the total wavelength and you get theta = lambda/dx...where theta is the angular width of the spot...and that is CLASSICAL wave phenomenon call diffraction.
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