State the law of radioactive decay.
Plot a graph showing the number (N) of undecayed nuclei as a function of time (f) for a given radioactive sample having half life $\quad { T }{ 1/2 }.$
Depict in the plot, the number of undecayed nuclei at
(i) t = ${ 3T }{ 1/2 }$ and
(ii) t = ${ 5T }_{ 1/2 }$
The number of nuclei undergoing decay per unit time, at anv instant, is proportional to the total number of nuclei in the sample at that instant. 1
