Physics

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

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