# NEET Physics Nuclei Questions Solved

The radioactivity of a sample is ${A}_{1}$ at a time ${t}_{1}$ and ${A}_{2}$ at time ${t}_{2}$.  If the mean life of special men is T, the number of atoms that have disintegrated in the time interval of ${t}_{2}-{t}_{1}$ is

(1) ${A}_{1}-{A}_{2}$             (2) $\frac{{A}_{1}-{A}_{2}}{T}$               (3) $\left({A}_{1}-{A}_{2}\right)T$                (4) ${A}_{1}{t}_{1}-{A}_{2}{t}_{2}$

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