Absolute Dating Answers
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What is the age of a meteorite if potassium-40 decayed from 80 g to 10 g? The half-life of potassium-40 is 1.3 billion years.
A
1.3 billion yearsB
2.6 billion yearsC
3.9 billion yearsD
5.2 billion years2
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Which statement explains how determining the age of the remains of living things is similar to dating rocks?
A
Organisms and rocks both contain stable and unstable elements.B
Organisms contain the same unstable elements as those found in rocks.C
Elements in rocks decay at the same rate as elements in the remains of organisms.D
Rocks and organisms both have gases trapped inside that are measured to determine age.3
Which phrase describes carbon-14 dating?
A
uses the rate at which nitrogen-14 decays into carbon-14B
dates the remains of organisms to determine when they diedC
measures the number of unstable elements in ancient volcanic rocksD
determines the age of ancient fossils older than 50,000 years old4
Study the diagram of radioactive decay.
A
atoms and elementsB
elements and gasC
energy and particlesD
gas and atoms5
How is radioactive decay used to date sedimentary rocks?
A
The amounts of potassium and argon in sedimentary rocks are measured.B
The amounts of carbon-14 and nitrogen in sedimentary rocks are measured.C
The amounts of unstable elements in each layer of the sedimentary rocks are compared.D
The amounts of unstable elements in the volcanic layers above and below the sedimentary layers are measured.6
Which property of argon makes it useful for potassium-argon dating?
A
It decays into potassium.B
It is an unstable element.C
It remains trapped in rock.D
It is useful only for dating newer rock.7
The chart shows rate of decay.
A
years of decayB
quantity of energyC
number of stable atomsD
amount of material that has not decayed8
Which stable element is used to determine the age of volcanic rock?
A
argonB
carbon-14C
potassiumD
carbon-129
Which phrase describes one characteristic of radioactive elements?
A
are produced in a laboratoryB
decay at a constant rateC
have a consistent number of particlesD
release energy and particles to maintain radioactivity10
The graph shows calculations for potassium-argon dating.
A
They can estimate that all the potassium will have decayed within 6.5 billion years.B
They can tell that 1/8 of the argon gas will be left after 3.9 billion years.C
They can determine that a rock is 1.3 billion years old if 1/2 of the potassium has decayed.D
They can see that potassium’s half-life varies from every 1.3 billion years to every 5.2 billion years.Did you find these answers helpful?
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