Phosphorus-32 (half-life

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

Problem

=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}