In the Bohr atom, electrons move on classical circular orbits that have angular momenta lh/2pi,
where l = 1, 2, . . ..
Show that the radius of the ﬁrst Bohr orbit is a0 and that the model predicts the
correct energy spectrum.
In fact the ground state of hydrogen has zero angular momentum. Why
did Bohr get correct answers from an incorrect hypothesis?
The Attempt at a Solution
Ok so i've done the first part. I'm just not sure on the last question - why did bohr get correct answers from an incorrect hypothesis?