I The expected value (or mean) of X

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hi. How to obtain the expected value of x in the momentum space ?
2019-10-19 12_36_45-Quantum.Physics.3rd.Edition (3) - WinDjView.png
 

PeroK

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Looks like you have answered your own question.
 
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Looks like you have answered your own question.
I only have the result. But I don't have the perfect solution to tell me how to achieve that. I'm looking for a solution.
 

PeroK

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I only have the result. But I don't have the perfect solution to tell me how to achieve that. I'm looking for a solution.
Whatever textbook you are learning QM from ought to have a derivation. If not, you should be able to find one online.
 
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Whatever textbook you are learning QM from ought to have a derivation. If not, you should be able to find one online.
In my textbook only the result has been written, and not the complete solution.
Yet, yes, you are right. I search for a complete solution online.
 

PeroK

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In my textbook only the result has been written, and not the complete solution.
Yet, yes, you are right. I search for a complete solution online.
There's one here, for example.

 
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