19. When a radio-isotope in a fossil with a half-life of 3,000 years has been reduced to 1/8th of its original amount, how old is the fossil? a. 2,400 years b. 36,000 years c. 9,000 years d. 12,000 years e. 18,000 years
19. When a radio-isotope in a fossil with a half-life of 3,000 years has been reduced to 1/8th of its original amount, how old is the fossil? a. 2,400 years b. 36,000 years c. 9,000 years d. 12,000 years e. 18,000 years
Chapter16: Evidence Of Evolution
Section: Chapter Questions
Problem 7SA: If the half-life of a radioisotope is 20,000 years, then a sample in which three-quarters of that...
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