A linear particle accelerator using beta particles collides
electrons with their anti-matter counterparts, positrons. The
accelerated electron hits the stationary positron with a velocity
of 13 x 106 m/s, causing the two particles to
annihilate.
If two gamma photons are created as a result, calculate the energy
of each of these two photons, giving your answer
in MeV (mega electron volts), accurate
to 1 decimal place. Take the mass of the electron to be 5.486
x 10-4 u, or
9.109 x 10-31 kg.
Note: Assume that the kinetic energy is also converted into the
gamma rays, and is included in the two photons.