Determine the age of ancient wooden items if it is known that the specific activity of C 14 nuclide in them amounts to 3/5 of that in lately felled trees. The half-life of C 14 nuclei is 5570 year.
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Sol. In old wooden atoms the number of 
nuclei steadily decreases because of radioactive decay. (In live trees biological processes keep replenishing 
nuclei maintaining a balance. This balance starts getting disrupted as soon as the tree is felled.)
If 
is the half life of 
then
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