Radioactive Decay

Presentation

•

Science

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7th - 9th Grade

•

Practice Problem

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Hard

Kristina Read

Used 2+ times

FREE Resource

12 Slides • 6 Questions

Multiple Choice

How have scientists been able to determine the ages of rocks in the Grand Canyon?

Using fossil records found in the rocks

Scientists determine the ages of rocks in the Grand Canyon using radiometric dating techniques.

By analyzing the color of the rocks

Through visual inspection of rock layers

Multiple Choice

How can the half-life of a radioisotope be used to date a rock?

The half-life of a radioisotope is irrelevant to geological dating.

The half-life indicates the total age of the rock directly.

The half-life of a radioisotope can be used to date a rock by measuring the ratio of isotopes and calculating the time elapsed based on the number of half-lives.

Half-lives can only be used for dating organic materials.

Multiple Choice

Why can’t carbon-14 dating be used to date specimens older than about 60,000 years?

Carbon-14 dating relies on the presence of other isotopes for accuracy.

Carbon-14 dating is effective for dating fossils and rocks.

Carbon-14 dating cannot be used for specimens older than about 60,000 years due to the negligible amount of carbon-14 remaining.

Carbon-14 dating can be used for specimens up to 100,000 years old.

Multiple Choice

What is radioactive dating?

A method for measuring temperature changes in rocks.

A process for identifying minerals in soil samples.

A technique for predicting future geological events.

Radioactive dating is a technique for determining the age of materials using the decay rates of radioactive isotopes.

Fill in the Blanks

Which radioisotope in the Table could you use to date a fossil thought to be about 500 million years old? Explain your choice.

Type answer...

Fill in the Blanks

Why does the amount of carbon-14 in an organism remain the same throughout the organism’s life? Why does the amount change after the organism dies?

Type answer...

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