A gamma ray photon creates an electron-positron pair. If the rest mass energy of an electron is 0.5MeV and the total K.E. of the electron-position pair is 0.78MeV

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A gamma ray photon creates an electron-positron pair. If the rest mass energy of an electron is 0.5MeV and the total K.E. of the electron-position pair is 0.78MeV, then the energy of the gamma ray photon must be.
17
Jun
A gamma ray photon creates an electron-positron pair. If the rest mass energy of an electron is 0.5MeV and the total K.E. of the electron-position pair is 0.78MeV, then the energy of the gamma ray photon must be. A gamma ray photon creates an electron-positron pair. If the rest mass energy of an electron is [...]
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