Posted by **will** on Wednesday, June 8, 2011 at 2:44pm.

A single photon in empty space is transformed into an electron and a positron, each with rest mass m(e).

(a) show that the folowing process is dynamically impossible.

(b) Explain in detail how this process can be made possible

(c) for part b what would be the minimum photon energy required for this to happen?

Show all steps in calculation

- physics (special relativity) -
**drwls**, Wednesday, June 8, 2011 at 10:00pm
Gamma rays of sufficient energy can create a positron and an electron, if the photon energy exceed 2 m c^2.

This can only happen in the presence of another mass , which is needed to allow both energy and momentum to be conserved. Sone of the original photon momentum has to be transferred to another mass.

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