Physics

Problem

A sealed ampoule contains

0.20\,\mu\text{g}

^{222}

Rn (half-life

=3.8\,\text{d}

). What will be the activity of the gas after

5.0\,\text{d}

? a)

0.68\,\text{GBq}

1.15\,\text{GBq}

0.46\,\text{GBq}

0.57\,\text{GBq}