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Activity of radioactive element decrease...

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

`A_(0)//3`

B

`A_(0)//6`

C

`A_(0)//9`

D

`A_(0)//18`

Text Solution

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The correct Answer is:
C
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