GENETICS AND EVOLUTION
EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Carbon 14 has a half life of 5, 730 years. If a fossil sample has 25% of the original carbon 14 in it, how old is the fossil?
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5, 730 years old
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11, 460 years old
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17, 190 years old
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None of the above
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Explanation:
Detailed explanation-1: -If an archaeologist found a fossil sample that contained 25% carbon-14 in comparison to a living sample, the time of the fossil sample’s death could be determined by rearranging equation 1, since Nt, N0, and t1/2 are known. This means that the fossil is 11, 460 years old.
Detailed explanation-2: -Question: How long will it take for 25% of the C-14 atoms in a sample of C-14 to decay? The half-life for the radioactive decay of C-14 is 5730 years.
Detailed explanation-3: -1 Answer. Johnson Z. The sample is approximately 4065 years old.
Detailed explanation-4: -100 grams= 25 grams carbon 14 and 75 grams nitrogen 14. We can say that it is about 11 400 years. We can use logarithms to solve the problem.
There is 1 question to complete.