Q.

Activity of a radioactive element decreased to one-third of original activity I0 in 9 yr. After further 9 yr, its activity will be

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a

I0

b

23I0

c

I09

d

I03

answer is C.

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Detailed Solution

I→I03→ I09
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Activity of a radioactive element decreased to one-third of original activity I0 in 9 yr. After further 9 yr, its activity will be