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1. Archeologists find out animal fossils which contains 65% of carbon -14 radioactive isotope. Please calculate how many years ago from now that animal was

1. Archeologists find out animal fossils which contains 65% of carbon -14 radioactive isotope.
Please calculate how many years ago from now that animal was died?
Hint:
a) Radioactive Carbon - 14 isotope has half-life time 5600 years.
b) Calculate decay constant k of Radioactive Carbon - 14
Use radioactive decay formula:
N_t = N₀
\fkt\fkt\fIlair n glass\fn 1 S

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