Problem 28. Consider the process A* + A+), and A* is stationary (at rest). This is the process
that an excited atom emits a photon and goes back to the ground state atom A. Assume that the
excited atom has a rest mass M6. Show that
v-mi (loro)
hvo
(4.3.14)
= 1
2M
where v is the photon frequency if the recoil is taken into account, and vo is the photon frequency
if the recoil is not taken into account.
