I have this state function that I've gotten to the form: [tex]\Psi = A*\exp[iE_1 t/h] + B*\exp[4iE_1 t/h][/tex] where A and B are functions of x. I know the energy. The h's are h-bars. The state function is suppose to describe a proton and I'm asked to find the frequency. My first thought is to somehow combine the terms such that I would have something like [tex]\Psi = C*\exp[i\omega t][/tex] Where [tex]\omega[/tex] would be the angular frequency. I'm having some trouble trying to get it to this form. What I want to know is if this is the correct approach. Let me know if I need to give any more info. Thanks in advance.