The activity of a radioactive element de...

The activity of a radioactive element decreases to one third of the original activity `I_(0)` in a period of nine years. After a further lapse of nine years, its activity will be

A

`I_0`

B

`2/3I_0`

C

`I_0/9`

D

`I_0/6`

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The correct Answer is:

C

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