# Bhor theory

1. Oct 20, 2009

### phymatter

I was just studying the Bhor theory and found that if we assume energy is quantised in (nh/2pi) then we can say that the angular momentum of electron is mvr=(nh/2pi) , but the units of (nh/2pi) is joules(Kg m2/s2) as it is energy and of mvr is Kg m2/s so how is it possible to equate them??????

2. Oct 20, 2009

### Staff: Mentor

The units of h (and thus nh/2pi) is Joule-sec, not Joules. Bohr uses angular momentum quantization to derive the quantized energy levels.