Quantum question - hamiltonian

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SUMMARY

The discussion centers on the necessity of a time-independent Hamiltonian (H) in quantum mechanics, specifically in relation to the Time-Dependent Schrödinger Equation (TDSE) and Ehrenfest's theorem. The user questions the requirement for H to be time-independent, arguing that differentiating the expectation value with respect to time yields zero regardless of H's time dependence. The conversation highlights the implications of Ehrenfest's theorem in demonstrating the constancy of the expectation value of H.

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Homework Statement



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The Attempt at a Solution



so i don't see why you need H to be time independent..

if you use TDSE to differentiate <Ek| psi> then you get d/dt of that = 0 regardless of whether H is time indep? surely?

Also not sure how to do it using Ehrenfest's theorem. I know that this would show the expectation value of H is constant, but how would this show what is required/// thanks
 

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