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.