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The activity of an old piece of wood is ...

The activity of an old piece of wood is just one fourth of a fresh piece of wood. If half life period of `""^(14)C` is about 6000 years, the age of old piece of wood is:

A

6000 years

B

3000 years

C

9000 years

D

12000 years

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The correct Answer is:
D
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