What experiment demonstrates Heisenberg's uncertainty principle?

[TrickyDicky]

That's the modelling bit. Its used all the time in applied math eg short electrical impulses are modeled by a Dirac delta function - that the slit is of very small width is modeled similarly.

Thanks
Bill

That's fine for electrical impulses, now go ahead and try that modelling bit to approximate Heisenberg inequality for position and momentum, you are welcome to try Δx=0 or Δp=0 and see what you get. It's no big deal, just modelling...

 

[Quds Akbar]

Theoretically, they take every possible path connecting the two points and they can exist anywhere during the trip. It is all based on probability.