A radioisotope has a half-life of 3 h and an initial activity of 2.0 mCi

PHYSICS · Single correct · A Level · Physics · Nuclear physics · Nuclear 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}

(b)

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

(c)

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

(d)

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