- 797
- 173
[Emphasis added]Nothing hinders you to measure either Δx or Δpx of the particle as precisely as you want (and being technically able to do).
What if the slit width is very small, and the detector screen has a fine resolution. The particle will then make a small dot at a precise location when it lands. Then you know both the precise position and momentum of that particle at the same time, correct?