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JEE Main & Advanced Physics Nuclear Physics And Radioactivity Question Bank Nucleus, Nuclear Reaction

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    A gamma ray photon creates an electron- positron pair. If the rest mass energy of an electron is 0.5 MeV and the total K.E. of the electron- positron pair is 0.78 MeV, then the energy of the gamma ray photon must be    [MP PMT 1991]

    A)            0.78 MeV                               

    B)            1.78 MeV

    C)            1.28 MeV                               

    D)            0.28 MeV

    Correct Answer: B

    Solution :

               Energy of g-ray photon =\[0.5+0.5+0.78=1.78\ MeV\].


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