1. The problem statement, all variables and given/known data A gaussian wave packet is given by the formula: Ψ(x)=(1/(π1/4d1/2))eikx-(x2/2d2) Calculate the expectation value in this quantum state of the momentum squared. 2. Relevant equations <p2>=-ħ∫Ψ*(X) (d2Ψ(x)/dx2) dx ∫e(-x2/d2) dx= d√π ∫xe(-x2/d2) dx =0 ∫x2e(-x2/d2) dx = (d3√π)/2 3. The attempt at a solution Here is my attempt at a solution. I got ħ2k2. The correct answer is ħ2k2 + ħ2/(2d). All help is very much appreciated.