Physics

Problem

A freshly prepared sample of iodine-131, used in medical diagnostics, has an initial activity of

4.0\times10^{8}\,\text{Bq}

. The half-life of iodine-131 is

8.04\,\text{days}

. Answer the following: a. (i) Calculate the decay constant of iodine-131 in

\text{s}^{-1}

. b. (ii) Determine the activity of the sample after

24.0\,\text{days}

. c. (iii) How long (in days) will it take for the activity to fall to

1.0\times10^{7}\,\text{Bq}