NEET Physics Nuclei Questions Solved

In a radioactive material the activity at time ${t}_{1}$ is ${R}_{1}$ and at a later time ${t}_{2}$, it is ${R}_{2}$. If the decay constant of the material is $\lambda$, then

(a) ${R}_{1}={R}_{2}{e}^{-\lambda \left({t}_{1}-{t}_{2}\right)}$                                    (b) ${R}_{1}={R}_{2}{e}^{\lambda \left({t}_{1}-{t}_{2}\right)}$

(c) ${R}_{1}={R}_{2}\left(\frac{{t}_{2}}{{t}_{1}}\right)$                                          (d) ${R}_{1}={R}_{2}$

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