Bohr's model of the atom

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Homework Statement



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?


Homework Equations





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?
 

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