A radioactive element decays by -emission

PHYSICS · Subjective · CBSE · Physics · Nuclei · Nuclei

Problem

A radioactive element decays by β\beta-emission. A detector records nn beta particles in 2 s2\,\text{s} and, in the next 2 s2\,\text{s}, it records 0.75n0.75n beta particles. Find the mean life correct to the nearest whole number. Given ln⁡2=0.6931\ln 2=0.6931 and ln⁡3=1.0986\ln 3=1.0986.

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