5.3.4: Radiometric Dating

Multiple Choice

The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes (3 half-lives) has elapsed?

• 100.0g
• 50.0g
• 12.5g

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Complete Lesson 5.3.3 in Edio

​5.3.3

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Multiple Choice

Which best describes the behavior of radioactive isotopes?

• They will only become radioactive if developed by scientists in a lab.

• They remain stable and do not undergo any change.

• They will break down and transform into different elements.

Multiple Choice

How is radiometric dating used to determine the age of geologic materials?

• By analyzing the rate of decay of radioactive isotopes.

• By measuring the strength of magnetic fields in rocks.

•  By studying the patterns of fossil distribution.

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