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Two radioactive materials {X}_{{{1}}} and {X}_{{{2}}} have dec

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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 of the number of muclei of $X_{1}$ to that of $X_{2}$ will be $\frac{1}{e}$ after a time

λ

\frac{1}{2} λ

\frac{1}{4 λ}

\frac{e}{λ}

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Oliver Discussed

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 of the number of muclei of

X_{1}

to that of

X_{2}

will be

\frac{1}{e}

after a time

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