Example 1.14
 Momentum of photon is 6.630000e-24 Kgm/s while Momentum of electron is 6.630000e-24 Kgm/s 
 which are equal
 Total Energy of photon is 12.431250 KeV while Total Energy of electron is 0.512026 MeV 
 Ratio of kinetic energies is 1.214286e-02