Physics

Physics

Problem

A radioisotope has a decay constant of

0.035\,\text{day}^{-1}

. If it initially contains

8.0\times10^{20}

undecayed nuclei, how many nuclei remain after

20\,\text{days}

? a)

8.0\times10^{20}

b)

1.6\times10^{20}

c)

4.0\times10^{20}

d)

2.5\times10^{20}

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