1. PH 401 Dr. Cecilia Vogel

2. Review  Go over exam #1 1.b (don’t mix ftns of x and p) 2.d (  depends on time, but  2 does not 3.a ((x-0) 2 means centered at x=0, iax means p=  a) 4.d (each term has its own e -iEt/ , there is not one overal value) 5. c (not a – it’s  (x) not x(t) and besides it’s 1D! Not b – info about p is hidden in there)

3. PAL Friday week 5  For an electron in a 1-nm infinite square well, which at t=0 is in a state: 1.Find the expectation value of energy of the electron (in eV or J). 2.Write down the wavefunction at time t>0,  (x,t). 3.Show that the probability density at time t>0 is real. 4.This is not a stationary state, so the probability density changes with time. Find the frequency at which the probability density repeats (in rad/s or Hz). This is not due, but you are responsible for it