Physics

Problem

A radium source shows an activity of

5.55\times10^{7}\,\text{Bq}

. Its activity expressed in millicurie (mCi) is closest to ____. a)

15\,\text{mCi}

1.5\,\text{mCi}

150\,\text{mCi}

0.15\,\text{mCi}