NNe025920 0749==−...27. (a) The half-life T1/2and the disintegration constant are related by T1/2= (ln 2)/λ, so T1/2= (ln 2)/(0.0108 h– 1) = 64.2 h. (b) At time t, the number of undecayed nuclei remaining is given by NNeNettT−−00212λln//.afWe substitute t= 3T1/2to obtain NNe0320125−lnIn each half-life, the number of undecayed nuclei is reduced by half. At the end of one
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