A sample of a radioactive isotope has an activity of at noon on Monday

PHYSICS · Single correct · A Level · Physics · Nuclear physics · Nuclear physics

Problem

A sample of a radioactive isotope has an activity of

8.0\times10^{3}\,\text{Bq}

at noon on Monday. The isotope’s half-life is

4.0\,\text{days}

. What is the activity of the sample at noon on the following Monday? (a)

4.0\times10^{3}\,\text{Bq}

(b)

1.4\times10^{3}\,\text{Bq}

(c)

2.4\times10^{3}\,\text{Bq}

(d)

2.0\times10^{3}\,\text{Bq}