[填空题]
The angular momentum 10 in the hydrogen atom is given qizlgdw1 rt2w c u;29, e7s9nqbothg.2u(s1jc9kw7ys ox k by the Bohr model and bg k jok9cs(wyx.1u2 7sy quantum mechanics. Compare the results for $L = mvr$.
or $L_{\text{QM}}$ = $\hbar$. asdfasdofadsf