Physics

Problem

The activity of a radioactive sample drops from

6400\,\text{Bq}

400\,\text{Bq}

30\,\text{days}

. What is the half-life of the sample? a)

10.8\,\text{days}

7.5\,\text{days}

15\,\text{days}

17\,\text{days}