Scientists use carbon dating to determine the age of fossils. 14C is a rare isotope of carbon that has a half life of 5730 years and decays into 14N. By measuring the amount of 14C remaining in a fossil, scientists can estimate when the organism died out to about 60,000 years. The atomic number of C is 6, and of N is 7.
If a fossil has only 25% of its 14C remaining, how old is it?
a. 5,730 years
b. 2,865 years
c. 1,432.5 years
d. 22,920 years
e. 11,460 years
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