Physics

Problem

A radioactive source has an initial activity of

1000\,\text{Bq}

and a half-life of

1.0\,\text{year}

. To maintain safety, immediately after every full year

20\%

of the remaining activity is discarded by removing a portion of the source. What will be the activity of the source immediately after the second such removal (i.e., just after

2\,\text{years}

)? a)

320\,\text{Bq}

160\,\text{Bq}

250\,\text{Bq}

200\,\text{Bq}

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