# Recoil Energy

by dranger35
Tags: energy, recoil
 Sci Advisor HW Helper P: 11,920 Since the energy of the photon is small (i think it's not $\gamma$,are u sure it's not MeV...?),you can use the nonrelativistic formula for KE... For a nice use of the total momentum conservation law ,assume the nucleus to be initially at rest. Daniel.