If an electron records it's spin quantum number = 1/2 inside it, where does the spin direction get recorded? And how does it get recorded: relative to what?
It must get recorded when the electron spin is observed.
It emits in many directions, but not infinitely many since nuclei have finite (not infinitesimal) size and they have a mean distance from each other.
Also not since there is the Planck length and an electromagnetic wave can't have smaller wavelength. Since photon wave packages has finite size...
I don't know how many frequencies there are, only that there isn't infinitely many. The colors only look like they merge continuously from one color to another but they don't at large enough resolution.
Spacetime don't need to absorb and emit: I postulate that spacetime can copy a particle onto a new position in space and erase the old copy instantaneously.
Come on: think of a spot on the screen that is set into motion.
Come on: the definition of isotropy is: "looking the same across...