Unveiling the Past: A Dive into Radiometric Dating

What is the half-life of a radioactive isotope?

• The time it takes for half of the original isotope to decay into another element

• The time it takes for the entire sample of an isotope to decay

• The time it takes for one-quarter of the original isotope to decay

• The time it takes for the radioactivity of a sample to increase by half

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NGSS.HS-PS1-8

Carbon-14 dating is most effective for dating materials that are:

• Less than 10 years old

• Between 100 and 50,000 years old

• Between 500,000 and 1 million years old

• More than 10 million years old

Which of the following elements is used in uranium-lead dating?

• Uranium-238

• Carbon-12

• Potassium-40

• Rubidium-87

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NGSS.HS-ESS1-5

The half-life of carbon-14 is approximately:

• 570 years

• 5,730 years

• 57,300 years

• 573,000 years

What is the end product of uranium-238 decay in uranium-lead dating?

• Lead-206

• Carbon-12

• Thorium-234

• Protactinium-231

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NGSS.HS-PS1-8

Why is carbon-14 dating not useful for fossils that are millions of years old?

• Carbon-14 has a short half-life

• Fossils do not contain any carbon

• The carbon-14 would have decayed to an undetectable amount

• Both A and C

In uranium-lead dating, what is the significance of finding the ratio of lead to uranium in a sample?

• It indicates the age of the Earth

• It determines the original amount of uranium in the sample

• It helps calculate the age of the sample

• It shows the temperature at which the rock formed

What is the principle behind radiometric dating techniques?

• The constant rate of sediment layer deposition

• The predictable rate of radioactive isotope decay

• The fluctuation of magnetic fields in rocks

• The erosion rates of geological features

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NGSS.HS-ESS1-6

What is the main advantage of uranium-lead dating over carbon-14 dating?

• It can date materials that are much older

• It is more accurate

• It is less expensive

• It is faster

Why is uranium-lead dating more suitable for dating the age of the earth?

• Because uranium-238 has a very long half-life

• Because uranium is more abundant than carbon

• Because lead is easier to detect than carbon

• Because uranium-lead dating is less expensive

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NGSS.HS-ESS1-6