A) 0.8 curie
B) 0.4 curie
C) 0.1 curie
D) 0.16 curie
Correct Answer: C
Solution :
Number of half lives \[n=\frac{10}{2.5}=4\] Þ \[\frac{A}{{{A}_{0}}}=\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{n}}\Rightarrow A=1.6\times {{\left( \frac{1}{2} \right)}^{4}}=0.1\ curie\]
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