1. The problem statement, all variables and given/known data Consider an electron trapped in an infinite square-well potential. If the width of the well is equal to the position uncertainty, what would be the lowest energy level for this electron 2. Relevant equations 3. The attempt at a solution I tried the equation for energy of a particle in a box but it requires the width and I don't know how to use the given fact that it is equal to the position uncertainty. Any help is greatly appreciated.