(4) Consider a system described by the Hamiltonian H, H = 0 a a
0 !,
where a is a constant. (a) At t = 0, we measure the energy of the
system, what possible values will we obtain? (b) At later time t,
we measure the energy again, how is it related to its value we
obtain at t = 0 ? (c) If at t = 0, the system is equally likely to
be in its two possible...