I'm currently, yet again, left clueless by a problem. See: http://idefix.physik.uni-freiburg.de/~aufgabe/QMI2004/qm3/node1.html [Broken] Ok, so they give the Psi(x) in position space, and the first question is to give the corresponding, normalized wave equation in momentum space. You do a fourier transform, no? Psi(p)=Int ((1/sqrt2pi) Psi(x) (e^ipx/hbar) dx no? From that, I get Psi(p)=(2hbar/(p sqrt2pi)) sin (pa/hbar) or....? After that, I tried to get the expectation value, <p>, but with poor results. Integrate Psi* Psi p dp, yeah? What I get is 4hbar^2/(2pi p^2) [ln|p| sin^2(pa/hbar)] Now, I know this has to be wrong, but I have no idea what I'm doing to screw it up. I tried to do <p^2> and <x> and it just gets worse, and messier. WHAT AM I DOING WRONG?? Pleease help. Thank you :) edit: I think I've got it! Well, at least part of it. I've gotten my expectation values for p and x to be zero, and I think my x^2 and p^2 are wrong, but... I can't think of anything else... so, it's staying right now with <p^2>= (2hbarp*sinpa)/pi <x^2>= A^2 (2a^3/3) Working on the rest, still... but coming a bit further?