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Part A Calculate the energy by the reaction between one electron and one positron. E=(2)mc^2 E=(2)(9.109x10^-31 kg)(3.00x10^8)^2 E=1.63962x10^-13 J Part B Assuming that the two gamma ray photons have the same frequency. h*f= E/2= mc^2 solve for f (6.626x1...