Radioactive Decay and Half-Lives

Radioactive Decay and Half-Lives

Assessment

Interactive Video

Chemistry, Physics, Science

9th - 10th Grade

Hard

Created by

Patricia Brown

FREE Resource

The video tutorial covers the topic of nuclear chemistry, focusing on radioactive isotopes and the concept of half-life. It explains the instability of radioactive isotopes and how they decay over time, emitting radiation. The tutorial introduces the concept of half-life as a measure of stability and provides examples of isotopes with varying half-lives, such as potassium-40 and sodium-24. A chalk analogy is used to help conceptualize half-life, and the tutorial includes problem-solving exercises involving isotopes like lead-194 and germanium-66.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a radioactive isotope?

A form of energy

A stable element that does not decay

A type of chemical bond

An unstable element that eventually decays

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the graph of a radioactive isotope's decay show?

The increase in material over time

The constant amount of material

The decrease in material over time

The stability of the material

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the half-life of an isotope?

The time it takes for the isotope to double in quantity

The time it takes for the isotope to become stable

The time it takes for half of the atoms to decay

The time it takes for all atoms to decay

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which isotope has a half-life of 1.3 billion years?

Lead-194

Germanium-66

Sodium-24

Potassium-40

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the chalk analogy, what happens after 15 minutes?

The chalk becomes radioactive

The chalk doubles in size

Half of the chalk remains

All the chalk is gone

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

After two half-lives, what fraction of the original material remains?

1/16

1/8

1/4

1/2

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How much of Lead-194 remains after 44 minutes?

1/16

1/2

1/4

1/8

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