32 mg of pure has an activity of

PHYSICS · Multi-part · A Level · Physics · Nuclear physics · Nuclear physics

Problem

32 mg of pure

^{238}_{94}\text{PuO}_2

has an activity of

6.4 \times 10^7 \text{ dps}

. Calculate (i) the half-life of

^{94}\text{Pu}^{238}

. (ii) the amount

\text{PuO}_2

left, if 100 mg of

\text{PuO}_2

is kept for 5000 year.