Physics - Modern Physics Question with Solution | TestHub

Given that, half-life of tritium

$t_{1/2}=12.5$years

$T=25$years

$\therefore$Number of half-life,$n=\frac{T}{t_{1/2}}=\frac{25}{12.5}=2$

$\therefore$Fraction of sample remain undecayed

$N=N_0{\left(\frac{1}{2}\right)}^n,$where,$N_0=$initial sample

$=N_0{\left(\frac{1}{2}\right)}^2=\frac{N_0}{4}$