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The activity of a radioactive element de...

The activity of a radioactive element decreased to one - third of original activity `I_0` in 9 yr. After further 9 yr, its activity will be

A

`I_0`

B

`(2)/(3)I_0`

C

`I_(0)/9`

D

`I_(0)/6`

Text Solution

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The correct Answer is:
C
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