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8Sci_RadiometricDati

Radiometric Dating (Tabat-2014)

QuestionAnswer
Which radioactive element would geologists most likely use to accurately calculate a 10,000 year old fossil's age? carbon-14 with a half life of 5,700 years
Radioactive dating is used to study which element in igneous and metamorphic rocks? uranium
Which method of radioactive dating would be used in determining the age of a human fossil? carbon-14
If the half-life of potassium-40 is 1.3 billion years and an igneous rock is found with 25% potassium-40, what is the absolute age of this rock? 2.6 billion years
What method do scientists most often use in determining the age of the Earth? they compare the amount of uranium and the amount of lead formed in radioactive dating of rock layers
Why is uranium used in radioactive dating? it is a mildly radioactive substance that breaks down at a slow and steady pace which cannot be altered by temperature or pressure
Why does carbon-14 dating help scientists determine the approximate time a species became extinct? carbon-14 decreases at a constant rate over time
Why is radioactive decay useful to scientists? it is used to determine age of rocks because decay occurs at a constant rate
What is true about different isotope pairs used for radiometric dating? they have different rates of decay
What is half-life? the amount of time it takes for 1/2 of the radioactive isotope in a rock to decay
What is the radioactive isotope considered to be in rocks? the parent isotope
What is it when radioactive elements release excess energy and decay into a more stable element? the daughter isotope
What are isotopes? atoms of the same element that have different atomic weights such as oxygen-18 and oxygen-16
What are unstable isotopes usually? radioactive
Created by: masonteach
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