On Friday, May 29, 2020 at 8:11:12 AM UTC-6, Alan Grayson wrote: > > > > On Friday, May 29, 2020 at 6:26:20 AM UTC-6, John Clark wrote: >> >> On Thu, May 28, 2020 at 6:28 PM Alan Grayson <[email protected]> wrote: >> >> *> Wiki has a good article on this. Oddly, when I took E&M courses, >>> undergraduate and graduate, I don't recall this issue ever being discussed, >>> at least not in detail. I don't recall any detailed discussion of Planck's >>> radiation law; that is, how it's derived. AG * >>> >> >> Wow, you must have had some pretty crappy physics courses! >> >> John K Clark >> > > In E&M, Yes, but surely not in QM. When we got to Maxwell's displacement > current, the professor did some hand-waving related to delta functions, > which was very unsatisfying. A good course in E&M would, IMO, include a > rigorous discussion of Planck's BB formula, since it is where quantum > physics begins, and including a rigorous treatment Maxwell's displacement > current and wave solutions of the Maxwell's equation. I doubt you have had > a good course in QM, and in physics in general, since you deny that > theories of physics start with postulates, when they obviously do. AG >
If you doubt my position on postulates when it comes to physical theories, let me give you a simple example, namely the invariance of the measured SoL (independent of motion of source and recipient). This *postulate* is highly un-intuitive, but it was used by Einstein in his 1905 paper on SR to derive the Lorentz transformation. In QM, Schroedinger's equation is one of the postulates, as well as Born's Rule, and so forth. AG -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/c4c9f12b-9187-4a14-8cd3-86662f0b609e%40googlegroups.com.
