A sample initially contains atoms of a radionuclide whose half-life is

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

Problem

A sample initially contains

8.0 \times 10^{20}

atoms of a radionuclide whose half-life is

15\,\text{days}

. Approximately how many atoms remain after

40\,\text{days}

? (a)

1.0 \times 10^{20}

atoms (b)

1.3 \times 10^{20}

atoms (c)

3.2 \times 10^{20}

atoms (d)

5.5 \times 10^{19}

atoms