I'll use c=1 units through out.
Using 4-vector notation, the conservation of 4-momentum is written as
So the energy of both the photons is m/2, and the frequency is
Summation convention
So for the photon moving in +x direction
Thus, its energy is
on inserting the values given for speed=1/3.
Similarly for -x
Total energy of photons
This is expected because, a moving mass increases by a factor of and hence the energy. SO the total energy has to be
3. A particle of rest mass m moving in the a direction at a speed of...
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