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A piece of ancient wood shows an activit...

A piece of ancient wood shows an activity of `3.9` disintergration per sec. per gram of `.^(14)C`. Calculate the age of the wood. `T_(1//2)` of `.^(14) C=5570` years. Activity of fresh `.^(14)C=15.6` disinteration per second per gram.

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[11140 yrs]
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