a. Can the eigenvalue of an operator be a complex number? Explain

b. Explain the difference between the expectation value of an operator and the eigenvalue of an operator.

c. A common confusion when presenting the quantum postulates is that a wave function can have a value of 0, and therefor the probability of finding a particle at a certain location can be zero.

So, a student might ask, "If a particle can be located on this side or located on that side, but there is a value of zero in between them, how does it get from one side to the other?"