The activity of a radioactive elemen...

The activity of a radioactive elements (decay constant `lambda`) becomes `(1)/(3)` of initial activity `A_(0)` in 9 years then the decay constant after 9 years will :

A

`lambda `

B

`lambda //3`

C

`lambda //9`

D

`2 lambda // 3`

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The correct Answer is:

A

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