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## Homework Statement

If given, for instance, psi(phi, 0)=[1/sqrt(2pi)](cos^2(phi/2) + isin(phi)), which is the wavefunction at t=0, how do you go about finding the wavefunction at time t, psi(phi,t)??

## Homework Equations

## The Attempt at a Solution

Would it simply be psi(phi, t)=psi(phi,0)e^(-iEt/hbar)??

The given wavefunction is for a particle on a ring.... and for that, E_n=(hbar^2)(m^2)/(2I) where I=mr^2. Is that the value of "E" I plug into the above equation??

Is there any other constant that I have to multiply the psi(phi,t) equation by as a result of adding on the e^(-iEt/hbar) term??

Any help would be great, I'm not entirely sure if I get this :-/