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Physics
Physics
Problem
32 mg of pure
94
238
PuO
2
^{238}_{94}\text{PuO}_2
94
238
PuO
2
has an activity of
6.4
×
10
7
dps
6.4 \times 10^7 \text{ dps}
6.4
×
1
0
7
dps
. Calculate (i) the half-life of
94
Pu
238
^{94}\text{Pu}^{238}
94
Pu
238
. (ii) the amount
PuO
2
\text{PuO}_2
PuO
2
left, if 100 mg of
PuO
2
\text{PuO}_2
PuO
2
is kept for 5000 year.
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