Classical View of NMR
(compared to Quantum view)
Precession or Larmor frequency:
angular momentum (l)
l
wo
m
Bo
Simply, the nuclei spins about its
axis creating a magnetic moment m
Apply a large external field (Bo)
and m will precess about Bo at its
Larmor (w) frequency.

Important: This is the same frequency obtained  from the energy
transition between quantum states