f todd baker
My take is that what "quantum physics (QP)" is is mainly a semantics issue. The way I have sorted out this particular label for myself is that it is all the semi-classical stuff that came before the notion of a wave function arose; like black-body radiation, Bohr atom, Bohr-Sommerfeld atomic physics, Compton effect, photoelectric effect, deBroglie wave length, etc. Everything later I call quantum mechanics (QM). Once, for example, you start solving the Schrodinger equation you are doing QM, not QP. Again, that is just the way I compartmentalize. But the physics stands on its own, doesn't really need a label.