A) 8
B) 4
C) 6
D) 5
E) 9
Correct Answer: A
Solution :
The ratio of activities is \[\frac{A}{{{A}_{0}}}={{\left( \frac{1}{2} \right)}^{n}}\Rightarrow 0.004={{\left( \frac{1}{2} \right)}^{n}}\] \[\Rightarrow \] \[\frac{1}{250}={{\left( \frac{1}{2} \right)}^{n}}\] \[n=8\]You need to login to perform this action.
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