Physics - Modern Physics Question with Solution | TestHub

After two half lives${\genfrac{}{}{0.1ex}{}{1}{4}}^{\mathrm{th}}$fraction of nuclei will remain undecayed. Or,${\genfrac{}{}{0.1ex}{}{3}{4}}^{\mathrm{th}}$fraction will decay. Hence, the probability that a nucleus decays in two half-lives is$\genfrac{}{}{0.1ex}{}{3}{4}$