1. The problem statement, all variables and given/known data Here is another True or False question from the same practice test. Since the expectation of the momentum operator <p>=<n|pn> is zero for an energy eigen state of the harmonic oscillator, a measurement of the momentum will give zero every time (True or False). 2. Relevant equations N/A 3. The attempt at a solution This question sounds very false to me, since an expectation value implies a probability and not an absolute. However, I'm thinking it might be a trick question... Thanks!