The neutral pion decays by 
The rest mass of the neutral pion is 135 MeV/c2. What is the energy of each of the photons if the pion is at rest when it decays?
A. 270 MeV
B. 135 MeV
C. 67.5 MeV
D. 1.02 MeV
E. This decay cannot happen.
C. 67.5 MeV
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