Parapositronium is an unstable bound state of an electron and a positron. Its lifetime is given in
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Parapositronium is an unstable bound state of an electron and a positron. Its lifetime is given in natural units by τ = 2/mα5, where m is the mass of the electron and α is the fine structure constant. Restore the factors of h̅ and c by dimensional arguments and evaluate in seconds.
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