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>>First Order Radioactive Decay
>> $Two radioactive materials X1 and X2 cont$

Question

Two radioactive materials $X_{1}$ and $X_{2}$ contain same number of nuclei. If $6 λ s^{- 1}$ and $4 λ s^{- 1}$ are the decay constants of $X_{1}$ and $X_{2}$ respectively, the ratio of number of nuclei, undecayed of $X_{1}$ to that of $X_{2}$ will be (1/e) after a time:

A

$\frac{1}{2 λ} s e c$

B

$\frac{1}{1 0 λ} s e c$

C

$\frac{1}{5 λ} s e c$

D

$\frac{1}{λ} s e c$

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Updated on : 2022-09-05

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