Physics

Problem

A radioisotope has a half-life of 3 h and an initial activity of 2.0 mCi. Determine its activity after 9 h, expressed in kilobecquerel (kBq). a)

9.25 \times 10^{2}\,\text{kBq}

7.4 \times 10^{4}\,\text{kBq}

9.25 \times 10^{3}\,\text{kBq}

1.85 \times 10^{4}\,\text{kBq}