two questions:(adsbygoogle = window.adsbygoogle || []).push({});

1. besides using Ehrenfests theorem, is there another way of showing that the expectation value of momentum is zero in a stationary state ? (I don't see it when simply applying the definition on the stationary solution)

2. If we have a state that is a superposition of stationary states and we measure the energy, the wavefunction collapses to a single state, does it mean it will be stationary forever ?

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# Schrodinger equation - stationary states

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