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Activity of a radioactive element decreased to one third of original activity $I_{0}$ in 9 years. After further 9years, its activity will be

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I0/9

I0/6

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detailed solution

Correct option is C

In 9 years, activity becomesI=I03 . In further 9 years, activity would become I'=I·3=I03×3=I09 .

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Activity of a radioactive element decreased to one third of original activity I0 in 9 years. After further 9years, its activity will be

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Activity of a radioactive element decreased to one third of original activity $I_{0}$ in 9 years. After further 9years, its activity will be