PhysicsMedium183×since 2002Q6085A radioactive nucleus A with a half life T, decays into a nucleus B. At t = 0, there is no nucleus B. At sometime t, the ratio of the number of B to that of A is 0.3. Then, t is given by :At=Tlog(1.3)t = {T \over {\log (1.3)}}t=log(1.3)TBt=Tlog(1.3)t = T\log (1.3)t=Tlog(1.3)Ct=T2log2log1.3t = {T \over 2}{{\log 2} \over {\log 1.3}}t=2Tlog1.3log2Dt=Tlog1.3log2t = T{{\log 1.3} \over {\log 2}}t=Tlog2log1.3Check answerSkip