If a wavefunction can be in different states each with a different eigenvalue when operated on by an Hermitian operator then am I correct in thinking that the expectation value of that operator when acting on a superposition of states could give a value that does not equal any single one of the individual eigenvalues ?(adsbygoogle = window.adsbygoogle || []).push({});

If I am correct so far ; now comes my main question - I have read that the uncertainty is zero if the state is in an eigenstate ,ie for an operator A the uncertainty is zero implies A(psi) = <A>(psi) where <A> is the expectation value of A. What does this mean ?

Thanks.

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# Confused about eigenstates, uncertainties,expectation values

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