Physics

Problem

1\,\text{mg}

sample of pure

^{60}\text{Co}

(half-life

5.27\,\text{y}

; atomic mass

60\,\text{g mol}^{-1}

) is removed from storage. The initial activity of the sample is nearest to ____. a)

0.11\,\text{Ci}

1.6\,\text{Ci}

1.1\,\text{Ci}

11\,\text{Ci}