The boron-14 nucleus (mass: 14.02266 u) "beta decays," spontaneously becoming an electron (mass: 0.00055 u) and a carbon-14 nucleus (mass: 13.99995 u). What will be the speeds and kinetic energies of the carbon-14 nucleus and the electron? (Note: A neutrino is also produced. We consider the case in which its momentum and energy are negligible. Also, because the carbon-14 nucleus is much more massive than the electron, it recoils "slowly"; γu ≅ 1.)
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