When trying to work out the uncerainty in position of the expectation value I have read that you have to find <r^2> aswell as <r>^2. I have worked out the value of 3a/2 for <r> but what do I have to do to find <r^2>. Do I just sqare the whole function before I integrate?(adsbygoogle = window.adsbygoogle || []).push({});

Also as I am integrating I found, in a book a table that had a general form of integrations between 0 and infinity. I used it without giving it much thought but how would you evaluate this? Thanks

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# Uncertainty in expectation value.

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