Physics · 2022
NEET 2022 · 4 September · Code W6 · Q40
At any instant, two elements X_1 and X_2 have same number of radioactive atoms. If the decay constant of X_1 and X_2 are 10 λ and λ respectively,…
At any instant, two elements $\displaystyle X_1$ and $\displaystyle X_2$ have same number of radioactive atoms. If the decay constant of $\displaystyle X_1$ and $\displaystyle X_2$ are $\displaystyle 10 \lambda$ and $\displaystyle \lambda$ respectively, then the time when the ratio of their atoms becomes $\displaystyle \frac{1}{e}$ respectively will be :
Official answer
(3)
$\displaystyle \frac{1}{9 \lambda}$
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