Physics

Problem

A sealed source of a medical radioisotope has an activity of

8.0\,\text{mCi}

at 10:00. The isotope has a half-life of

6.0\,\text{h}

. What will be the activity of the source at 04:00 the next morning, 18\,h later? a)

2.0\,\text{mCi}

0.50\,\text{mCi}

1.0\,\text{mCi}

1.33\,\text{mCi}