Borov postulat

Moram priznati da me je ovo pitanje zbunilo. U raznolikoj literaturi koju posedujem nisam pronašao odgovor. Zbog toga sam ga postavio na jednom američkom sajtu, gde fizičari odgovaraju na raznorazna pitanja:

QUESTION:
If we postulate that L=n*a, a=const (Bohr's postulate), how we can testify that a=h/2π?

ANSWER:
There are lots of ways you can come up with Bohr's postulate, but when one first proposes a radical idea like this one the choice of constant is often empirical, that is you choose a constant which gives the right answers, in this case the energy levels of the hydrogen atom, the wavelengths of the spectrum.