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10^(-3) kg of a radioactive isotope (atomic mass 226) emits 3.72xx10^(10) alpha - particles in a second. Calculate the half-life of the isotope. If 4.2xx10^(2) joule energy is released in one hour in this process what is the average energy of the alpha -particles? Avogadro number is 6.02xx10^(26)// kmol and log_(e)2 =0.693 .