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khfrekek92
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Homework Statement
two photons collide head-on and create an electron and an anti electron. The energy of photon 1 is given, but not for photon 2.
Find the velocity β of the systems rest frame (where the total momentum is zero.)
Homework Equations
β=v/c
γ=1/√1-β^2)
β=pc/E
The Attempt at a Solution
I have tried this every way I could think of, by adding the two momentum four vectors and using a lorentz transform on them, by using the formula for speed of the rest from β=pc/E, but no matter what, I always need the energy of the second photon. How do I get around needing this?!
Thank you for your help