Recent content by melonhead

What exactly is the centre of mass frame? Is the net momentum in the centre of mass frame equal to 0 in every annihilation reaction?

So my question now is how would I go about proving that a single photon can't have a large enough E/p ratio? What I was trying to do is show that the ratio for the electron-positron pair will never equal to the ratio for a single photon. E/p of a photon is c, correct? To calculate the Energy...

Hi, I understand that momentum before and after annihilation must be conserved. However, why isn't it possible to have a net momentum not equal to zero before hand, (ex. an electron and a positron traveling head on, but at different velocities) and then just have a single photon travel in...