If a proton encounters an antiproton, then the two particles annihilate each other, generating two gamma rays. Supposing the particles were at rest when they annihilated, determine the energy of each of the two gamma rays generated. (The rest energies of an anti-proton and a proton are the same.)
i) 0.151 nJ
ii) 0.181 nJ
iii) 0.191 nJ
iv) 0.171 nJ