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Updated on : 2022-09-05

Solution

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Correct option is D)

Where, $λ$ is Decay constant; $N$ is number of atom at time $t$

So, number of atom of $A$ is given by, $N_{A}=N_{o}e_{−5λt}$

And that of $B$ are given by, $N_{B}=N_{o}e_{−λt}$

Taking ration we get: $N_{B}N_{A} =e_{−4λt}$

Given that: $N_{B}N_{A} =e_{−2}$

So, this will happen when, $t=2λ1 $

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