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A sample of
$_{38}Sr$
originally had an activity of
$0.500mCi(millicurie)$
.
What is the activity of the sample after
$30.0$
years?
$T_{30}$
of
$_{38}Sr$
is
$19.9$
years?
A
$6.51×10_{6}$
dps
B
$8.51×10_{6}$
dps
C
$7.51×10_{6}$
dps
D
None of these
Hard
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Correct option is C)
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