Physics

Problem

A freshly prepared

2.0\,\text{mg}

sample of pure

^{131}\text{I}

(molar mass

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

) is obtained. The half-life of

^{131}\text{I}

8.0\,\text{days}

. Calculate its initial activity in becquerel. (Take

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

and

1\,\text{day}=86400\,\text{s}