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albega
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Homework Statement
High energy photon of energy E collides with a low energy photon of energy 1eV. It forms an electron-positron pair. I have found the threshold energy as E=261GeV.
I am asked to find the speed of the centre of mass at this threshold energy.
Homework Equations
E=γmc2
The Attempt at a Solution
I can use conservation of energy to get the energy of the electron (or positron) say then use the above formula to find v from γ. I believe this then should be the CM speed. However it returns c. I don't believe that this is an acceptable solution (I don't have the answers though). Any thoughts would be helpful, thanks.
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