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.

## Answer this Question

## Related Questions

- relativity - Show that the following process is dynamically inpossible: A ...
- Physics - A single photon in empty space is converted into an positron and an ...
- Physics - A photon of energy E strikes an electron at rest undergoes pair ...
- physics - consider a stationary nucleus of mass M. show that the minimum energy ...
- physics - Q1) consider a stationary nucleus of mass M. show that the minimum ...
- electron - An electron drops from the fourth energy level, in an atom to the ...
- Physics - A gamma-ray photon produces an electron-positron pair, each with a ...
- physics - A gamma-ray photon produces an electron-positron pair, each with a ...
- Nuclear Chemistry - The half- life of a positron is very short. it reacts with ...
- chemistry - Help plzzz Besides the major types of radioactive decay, there are ...

More Related Questions