# Homework Help: Help Understanding the answer to a Quantum Mechanic problem

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1. Dec 17, 2017

### David0709

1. The problem statement, all variables and given/known data

The answer is as follows:

However they said that time t=0 so I am confused how the exponent has a t in it surely it should be zero. Thanks

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2. Dec 17, 2017

### Charles Link

They are telling you in part (b) to write $O(t)$ in terms of the "eigenstates at t=0". $O(t)$ is not required to be at $t=0$. (the eigenstates at $t=0$, is what they are referring to).b $\\$ Additional note: In the part you labeled "Answer: Unseen" , in the 3rd line, I think those should read $u^*_m(x)$ and $u_n(x)$, without any $t$ dependence.

Last edited: Dec 17, 2017
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