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Nuclear Physics, photons, electrons and positrons

  • Thread starter aimslin22
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  • #1
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Homework Statement


A photon of sufficient energy can spontaneously create an electron and positron. This will conserve charge and must conserve energy. What is the minimum energy photon (in MeV and J) that can create an electron-positron pair?


Homework Equations



V=W/q (?)


The Attempt at a Solution



I know that the photon must have twice the energy of the electron (or of the electron and positron added together), but I have no idea how to find it. I think I am missing the formula or some simple conversion, help please!
 

Answers and Replies

  • #2
Matterwave
Science Advisor
Gold Member
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Rest energy of an electron: 511KeV

Does that help?

It's obtained by just using the E=mc^2 formula on the Electron's mass.
 
  • #3
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Looks good to me! Thank you!
 

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