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  4. A gamma ray photon creates an electron, positron pair. If the rest mass energy of an electron is 0.5 MeV and the total KE of the electron, positron pair is 0.78 MeV, then the energy of the gamma ray photon must be

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Q. A gamma ray photon creates an electron, positron pair. If the rest mass energy of an electron is $0.5\, MeV$ and the total $KE$ of the electron, positron pair is $0.78\, MeV$, then the energy of the gamma ray photon must be

UPSEEUPSEE 2014

Solution:

Energy of $\gamma$ -ray photon $= 0.5 + 0.5 + 0.78$
$=1.78\, MeV$