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ehabmozart

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## Homework Statement

A positron with kinetic energy 2.2MeV collides with an electron at rest, and annihilate each other.

a. Calculate the average energy of the two gamma photons produced as a result of annihilation

## Homework Equations

## The Attempt at a Solution

I would infact calculate the energy in the left hand side including the rest masses.. isn't it.. So it would be (0.511 x 2) + 2.2 = 3.222 MeV .. But this doesn't seem the answer.. Any help guys?