1. The problem statement, all variables and given/known data The wave function for a particle in a infinitely deep potential well is at some point in time Φ(x) = Nx(a-x). In which probability gives the energy measurment a another value than E1 ,etc ground state 2. Relevant equations 1 = |cn|^2 = |<Φn|Ψ>|^2 (1) 3. The attempt at a solution If Ψn(x) = sqrt(2/a)sin(n*(pi)*x/a) be the eigenfunction and put it into (1) and integrate. Is this right method im doing ?