Activity of radioactive element decreased to one third of original activity \( R_{0} \) in 9 yea...

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Activity of radioactive element decreased to one third of original activity \( R_{0} \) in 9 years. After further 9 years, its activity will be
(A) \( R_{0} \)
(B) \( \frac{2}{3} R_{0} \)
(C) \( R_{0} / 9 \)
(D) \( R_{0} / 6 \)
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