(July 16, 2020 at 12:00 pm)ModusPonens1 Wrote:(July 16, 2020 at 7:47 am)polymath257 Wrote: [...]we explain the old ideas in terms of the new not the other way around. QM is the new set of ideas that works better than the old, classical ideas.
Newtonian physics still works for baseball. Newtonian and Einsteinian physics are false only insofar as they are incomplete. Quantum Physics offers deeper truths that are more complete but if you're going to figure out the trajectory of a baseball ... doing quantum calculations is probably overkill, no?
Of course. Once again, the behavior is ultimately based on QM, but, because the classical world can be explained in terms of the quantum, we can use Newtonian physics as an excellent approximation (as long as hbar is small compared to anything in the situation).
In the same way, using general relativity for the motion of that baseball is overkill: the Newtonian approximation is quite sufficient.
But, when dealing with the double slit experiment, the quantum eraser, or the Aspect experiment, the Newtonian approximation fails miserably.
