Photon pair production

[amazing tekkers]

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The minimum energy that a photon must have to undergo pair production (electron-positron) is:

A. 0.511 MeV. B. 1.022 MeV. C. 2.044 MeV. D. 0.256 MeV. E. any amount more than zero

The answer is B, anyone know how to find it?

 

[amy_k]

In Electron-positron production we are converting energy into mass, so the energy of the photon must be at least equal to the rest mass of the pair. Mass electron = 0.511 MeV, mass of positron is the same, so minimimum energy = 0.511*2 = 1.022

 

[amy_k]

They should give you that the rest mass of an electron is 0.511 MeV in the question?