Physics

Problem

a. A sample of a radioisotope shows an activity of

2.0\,\text{MBq}

. Five days later, the activity is found to be

125\,\text{kBq}

. Determine the half-life of the isotope in days. b. How much additional time (in days) will elapse before the activity of this sample falls to

10\,\text{kBq}