# Recoil Energy

by dranger35
Tags: energy, recoil
 P: 14 What is the recoil energy (in eV) of a 57Co nucleus emitting a 14.4 keV gamma ray? If anyone knows the equation that I can use, thanks.
 Sci Advisor HW Helper P: 11,833 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.

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