# Homework Help: Quantum Problems

1. Apr 12, 2010

### latentcorpse

I've attached my notes for this course that I'm taking.
I have a couple of questions about the material at the bottom of p15/top of p16.

Where does eqn 2.49 come from? Why is there an $|x,t \rangle$ on one side and a $| x \rangle$ on the other?

Where does eqn 2.50 come from? It's a rearranging of the line above essentially. But when i left multiply $\hat{H}(t) | x,t \rangle = - i \hbar \frac{\partial}{\partial t} | x,t \rangle$ by $\langle \psi |$, i don't get the right result since i don't think we can move the psi ket through either the hamiltonian operator or the time derivative, can we?

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