The activity of a radio active sample decreases to one third of its original value in 9 years, what will be the activity after further 9 years?

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Ao3

Ao6

Ao9

Ao18

answer is C.

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Detailed Solution

Ao3Ao = 129T 12 ⇒ 1(2)1T12= 1319 A' = Ao1218T12 = Ao13189 = Ao9

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