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what is the maximum number of pair electron-positron a 2 MeV photon can produce

what is the maximum number of pair electron-positron a 2 MeV photon can produce
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Answer #1

In pair-production, a photon is converted into a matter anti-matter pair. Some energy of the photon is converted into rest mass energies of the matter and anti-matter, the remaining energy is converted into the kinetic energy of the particles. The rest mass energy of an electron is 0.511MeV. The rest mass energy of a positron is also 0.511MeV. The minimum energy that a photon should have to create a single electron-positron pair is

1.022MeV photon can produce electron-positron pairs at rest.

The minimum energy that a photon must have to create two electron-positron pair is

The given photon only have 2MeV of energy, therefore the given photon can produce a maximum of 1 pair of electron-positron pair.

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