Do quantum physics apply universally at all scales?
Where do quantum physics apply?
Does the nucleus of an atom abide by the laws of quantum physics?
Like do we know the definitive/velocity position of a proton or that of a neutron-proton pair?
In other words, to which bodies does the Uncertainty Principle apply?
Are there wave functions for neutrinos, protons, neutrons, quarks or just for electrons?
And can you make a wave function for a larger body such as a molecule?
Where is the limit?
At our current state of knowledge, we would expect that quantum mechanics applies everywhere including at the scale of nuclei. However at the macroscopic everyday scale of objects (cars trucks buses planes), what it predicts is not generally different from the predictions of Newtonian mechanics, whereas at the size of atoms and atomic nuclei, the predictions of the behaviour of particles by quantum mechanics differs completely from what one would predict using Newtonian mechanics. There may be circumstances (distance scales, time scales,energy scales for example) in which quantum mechanics as we presently know it, is not an adequate description of nature. Those we are still seeking!
