Recent content by Nick Sinai

24.Cobalt-64 decays by a first order process by the emission of a beta particle. The Co-64 isotope has a half-life of 7.8 minutes. How long will it take for 15/16 of the cobalt to undergo decay? (A)7.8 min(C)23.4 min (B)15.6 min(D)31.2 min