Question. Suppose that a given Hamiltonian system has two eigenstates |ε1> and |ε2>l where εi denotes the cigenstate energy with ε2 - ε1> 0. At time t = 0 the state vector for the system has the form
ψ(t = 0) = (|ε1) + |ε2)).
(a) Write the form of the state vector at times t > 0.
(b) What is the probability of finding the particle in state |ε2> as a function of t?