
#1
Apr405, 09:28 PM

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. 



#2
Apr405, 09:42 PM

Sci Advisor
HW Helper
P: 11,863

Since the energy of the photon is small (i think it's not [itex] \gamma[/itex],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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