[itex][L_x,L_y]=i \hbar L_z \neq 0[/itex]. In fact it seems we can know only the modulus squared of the angular momentum and one component, at a same time.(adsbygoogle = window.adsbygoogle || []).push({});

However if I take an electron say in the fundamental state in the hydrogen atom, L=0. Since the modulus squared is equal to 0, it means that all components are worth 0 or I'm missing something? Wouldn't that mean that we can know "the 3 components of the angular momentum without any uncertainty when it's worth 0"? Where does the Heisenberg's uncertainty principle applies here?

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# Angular momentum and its uncertainty

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