Quantum question - hamiltonian

[bon]

Homework Statement

see attached

Homework Equations

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

 

[bon]

anyoneeee>?