1. The problem statement, all variables and given/known data A particle in an infinite square well has as its initial wavefunction ψ(x,t=0) = (1/√2)[φ1 + φ3]. Find |ψ(x,t)|2. Express it as a sinusoidal function of time using ω= π2*h/(2mL2). 2. Relevant equations Note that φn = √(2/L)*sin(nπx/L) for a well of width L. 3. The attempt at a solution I found something in my book which says that ψ(x,t) = Ʃbn*e-iωntφn. Therefore, my ψ(x,t) = (1/√2)[e-iω1t)φ1 + e-iω3t)φ3]. Is that right so far? Then, I can compute |ψ(x,t)|2, but I don't see how that is going to give me an answer in terms of ω. I have ωn though.