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Question

- 14λ
- 4λ
- 2λ
- 12λ

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Solution

Verified by Toppr

Decay equation is given by N=Noe−λt

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

So, number of atom of A is given by, NA=Noe−5λt

And that of B are given by, NB=Noe−λt

Taking ration we get: NANB=e−4λt

Given that: NANB=e−2

So, this will happen when, t=12λ

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