A laboratory requires a source that will have an activity of exactly from now

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

Problem

A laboratory requires a

^{32}\text{P}

source that will have an activity of

3.7\,\text{GBq}

exactly

28\,\text{days}

from now. The half-life of

^{32}\text{P}

14\,\text{days}

and its atomic mass is

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

. The mass of

^{32}\text{P}

that must be prepared today is closest to ____. (a)

0.69\,\mu\text{g}

(b)

0.34\,\mu\text{g}

(c)

1.4\,\mu\text{g}

(d)

0.14\,\mu\text{g}