1. The problem statement, all variables and given/known data Consider a particle in an infinite square well potential that has the initial wave-function: Ψ(x,0) = (1/√2) [Ψ_1(x) + Ψ_2(x)] where Ψ_1(x) and Ψ_2(x) are the ground and first excited state wavefunctions. We notice that <x> oscillates in time. FIND the frequency of oscillation 2. Relevant equations So, <x> = expected value integral over 0 to L Ψ_1(x) = √(2/L) sin(πx/L)e^(-iE/ћt) Ψ_2(x) = √(2/L) sin(2πx/L)e^(-iE/ћt) 3. The attempt at a solution I solved: <x> = [(1/2)-(16/(9π^2))]L (Not only did I do this by hand but I also checked it against mathematica so this is definitely not wrong) Real question is, WHAT is the frequency of oscillation actually? I have NO idea what the question is asking.