Help Understanding the answer to a Quantum Mechanic problem

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David0709
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Homework Statement


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The answer is as follows: [/B]

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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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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.
 
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