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JEE Main & Advanced Physics Nuclear Physics And Radioactivity Question Bank Self Evaluation Test - Nuclei

  • question_answer
    A gamma ray creates an electron-positron pair. If the rest mass energy of an electron is 0.5 MeV and the total kinetic energy of the electron-positron pair is 0.78 MeV, then the energy of the gamma ray must be

    A)  0.78 MeV

    B)  1.78 MeV

    C)  1.28 MeV

    D)  0.28 MeV

    Correct Answer: B

    Solution :

    [b] Energy of y-ray photon = Restmass energy+ K.E. \[=2\,(0.5)+0.78=1.78\,MeV\]


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