Concept explainers
Introduction:
The age of a rock is measured by radiometric dating method by using the decay of radioactive isotope of an element. The method requires that the half-life of the isotope which is the amount of time it takes for half of the original isotope to decay.
Answer to Problem 7A
Correct answer:
The correct answer is option (A) 18 years
Explanation of Solution
Explanation/justification for the correct answer :
Option (A) 18 years. As per the graph, the amount of time it takes for half of the original isotope to decay. The 50 percent of isotope will decay in 18 years. Thus, this is the correct answer.
The explanation for the incorrect answer :
Option (B) 36 years. The 78 percent of isotope will decay in 36 years. Thus, this is the correct answer.
Option (C) 54 years. The 84 percent of isotope will decay in 54 years. Thus, this is the correct answer.
Option (D) 72 years. The 95 percent of isotope will decay in 72 years. Thus, this is the correct answer.
Chapter 14 Solutions
Biology Illinois Edition (Glencoe Science)
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