Physics

Physics

Problem

Phosphorus-32 (half-life

=14.3\,\text{d}

, atomic mass

=32\,\text{g\,mol}^{-1}

) is required to have an activity of

2.0\times10^{8}\,\text{Bq}

exactly

10\,\text{d}

from now. What minimum mass of pure

^{32}

P should be supplied today? a)

1.9\times10^{-8}\,\text{g}

b)

3.1\times10^{-8}\,\text{g}

c)

3.1\times10^{-7}\,\text{g}

d)

2.6\times10^{-8}\,\text{g}

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