A) 1000 dis/sec
B) 250 dis/sec
C) 125 dis/sec
D) none of these
Correct Answer: C
Solution :
Remaining amount \[N={{N}_{0}}{{\left( \frac{1}{2} \right)}^{t/{{t}_{1/2}}}}\] \[\begin{align} & ={{10}^{3}}{{\left( \frac{1}{2} \right)}^{\frac{3}{1}}} \\ & ={{10}^{3}}\times \frac{1}{3}=125 \\ \end{align}\] Activity = 125 dis/sec
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