A radioactive material of half-life was kept in a nuclear reactor at two different…

PHYSICS · Single correct · CBSE · Physics · Nuclei · Nuclei

Problem

A radioactive material of half-life TT was kept in a nuclear reactor at two different instants. The quantity kept the second time was twice that kept the first time. If their present activities are A1A_1 and A2A_2, respectively, then their age difference is (1) Tln⁡2ln⁡2A1A2\frac{T}{\ln 2}\ln\frac{2A_1}{A_2} (2) Tln⁡A1A2T\ln\frac{A_1}{A_2} (3) Tln⁡2ln⁡A22A1\frac{T}{\ln 2}\ln\frac{A_2}{2A_1} (4) Tln⁡A22A1T\ln\frac{A_2}{2A_1}

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