Physics · 2008
NEET 2008 · Prelims · Code A · Q44
Two radioactive materials X_1 and X_2 have decay constants 5 λ and λ respectively. If initially they have the same number of nuclei, then the ratio…
Two radioactive materials $\displaystyle \mathrm{X}_1$ and $\displaystyle \mathrm{X}_2$ have decay constants $\displaystyle 5 \lambda$ and $\displaystyle \lambda$ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of $\displaystyle \mathrm{X}_1$ to that of $\displaystyle \mathrm{X}_2$ will be $\displaystyle \frac{1}{\mathrm{e}}$ after a time :
Official answer
(4)
$\displaystyle \frac{1}{4 \lambda}$
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NEET (UG) 2008 Physics question, with the answer from NTA’s final answer key. Where our answers come from.