The decay constant of a radioactive nuclide is

PHYSICS · Subjective · CBSE · Physics · Nuclei · Nuclei

Problem

1.2\times10^{-4}\,\text{s}^{-1}

. A laboratory sample of this nuclide shows an initial activity of

5\,\text{MBq}

. Determine the time needed for the activity to drop to

1\,\text{MBq}

. Give your answer in minutes.