Difficult
The activity of a sample of a radioactive material is ${A_1}$ at time ${t_1}$ and ${A_2}$ at time ${t_2}$ $({t_2} > {t_1})$. If its mean life is $T$,then:
- A${A_1}{t_1} = {A_2}{t_2}$
- B${A_1} - {A_2} = {t_2} - {t_1}$
- C${A_2} = {A_1}{e^{({t_1} - {t_2})/T}}$
- D${A_2} = {A_1}{e^{({t_1}/{t_2})T}}$
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