Physics

Problem

0.50\,\text{g}

sample of

^{60}\text{Co}

(half-life

5.3\,\text{yr}

, molar mass

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

) is stored for

1.0\,\text{yr}

. Determine its activity at the end of this period in curie. (Use

N_A = 6.02\times10^{23}\,\text{mol}^{-1}

1\,\text{yr}=3.15\times10^{7}\,\text{s}

and

1\,\text{Ci}=3.7\times10^{10}\,\text{Bq}