Plot a graph showing the variation of undecayed nuclei N versus time t. From the graph, find out how one can determine the half-life and average life of the radioactive nuclei.

Explanation

A graph showing the variation of undecayed nuclei N versus time ft has been plotted here.

Let at time t=0, the number of nuclei be `N_(0)`. Then time corresponding to `N = N_(0)/2` will give us the value of half-life period `T_(1/2)` of given radioactive nuclei.
Now average life of the nuclei
`tau=T_(1/2)/0.6931=1.44T_(1/2)`