Answer :

According to Bohr model, angular momentum (L=mvrn) of revolving electron must be integral multiple of (where h is plank constant) i.e. mvrnthis actually only gives the magnitude of angular momentum and direction can’t be concluded. That’s why it is wrong to say that H-atom has an angular momentum =ħ. So Bohr model doesn’t provide correct value of angular momentum.

Therefore option (a) is correct.

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