Expectation value of the expectation value

  • Thread starter jinksys
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  • #1
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Homework Statement


The expectation value of the position observable x is <x> = ∫ψ*xψdx. The expectation value of the expectation value, <<x>>=<x>, is still the expectation value...why?


Homework Equations





The Attempt at a Solution



All I can think of is that the expectation value is essentially an average, and the average of an average is the original average.

i.e.) A={2,8} The average is (2+8)/2 = {5}
The average of {5} = {5}.
 

Answers and Replies

  • #2
dextercioby
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The expectation value is a number which <comes out> of the integral of the expectation value of the the expectation value.
 

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