
#1
Nov2103, 04:01 AM

P: 16

Hi dear virtual friends,
I am now going to ask you something. I would be pleased if you would answer me. In an exam I was asked to show that for a particle in a box of width length L , delta (x)delta(p)>=h/(4*pi) holds. I think this is not a logical question. Because I think it is like asking something like this: Prove A using A. I would be really grateful if you would write something regarding this. Thank you. P.S. My problem is not envolving you in doing my homework. I just wanted to know if what I think is right or wrong. 



#2
Nov2103, 04:07 AM

P: 657

i think you were supposed to calculate Δx and Δp separately, then multiply the two together, and compare it to h/4pi.
you know, find the expectation value of x, and then the expectation value of x^{2} and all that jazz. of course you are not allowed to use the Heisenberg Uncertainty principle to show that the Heisenberg Uncertainty principle is true. that is circular. 



#3
Nov2303, 01:31 PM

P: 16

Thank you very much for youranswer.



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