Quantum Physics - Hamiltonian operator

Thread starter Mankul
Start date Oct 20, 2008
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Hamiltonian Operator Physics Quantum Quantum physics

1 reply · 3K views · last reply Oct 20, 2008

Mankul

Thread starter
Oct 20, 2008

Hi, Can you help me with this, I don't know how to go about solving this.

Question:

Printed problem text: the time evolution of a state vector, i h-bar d/dt |psi(t)> = H-hat |psi(t)>, where H-hat is the Hamiltonian operator. Asks to show that if Q-hat commutes with H-hat and is time independent, its expectation value is constant in time.

Discussion

borgwal

Oct 20, 2008

You have to show "something" does not change with time. So, start with writing down an expression for that "something", then take the time derivative, and see how far you get.

Quantum Physics - Hamiltonian operator

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