[填空题]
The angular momentum in the hydrogen atom is gives,-jn,yakqn/ v+/ n;ppw h/ chn both by thnw7q2 u4d0zl)8w3.ka sdbusle Bohr model and by kdlz u4)qn8s 7 duw3abwl2s0.quantum mechanics. Compare the results for $L = mvr$.
$L_{\text{QM}}$ = $\hbar$ or $L_{\text{QM}}$ = $\hbar$