Skip to main content
Half-Life

We explain half-life qualitatively, mathematically, and graphically. We also look at how we use this principle to find the age of objects.

Segment 7D: Half-Life We explain half-life qualitatively, mathematically, and graphically. We also look at how we use this principle to find the age of objects.

Premiere Date: August 1, 2018 | Runtime: 00:07:26

Support Materials

Learning Objectives

-Explore the nature of radioactive substances by understanding their half-life qualitatively and what that tells us about their stability.

-Understand how to graph the decay rate of a radioactive substance and relate this to the half-life of the substance.

-Calculate how much of a substance will remain after a certain number of half-lives have occurred.

-Investigate how half-life is used to find the age of objects.

Toolkit

Note-Taking Guide and Questions to Consider
Download
Practice Problems
Download
Modeling Radioactive Decay Lab
Download

Closer Look

Vocabulary

carbon dating - a method of determining the age of substances that contain organic material by looking that the ratio of carbon-12 to carbon-14 they contain.

half-life - the time it takes for half of a radioactive substance to decay.

radioactive decay - the spontaneous emission of charged particles and/or energy from an atom.

Georgia Standards of Excellence

SP6
Obtain, evaluate, and communicate information about nuclear changes of matter and related technological applications.
c
Develop and use mathematical models and representations to calculate the amount of substance present after a given amount of time based on its half-life and relate this to the law of conservation of mass and energy.

Request Teacher Toolkit

The Physics in Motion teacher toolkit provides instructions and answer keys for study questions, practice problems, labs for all seven units of study.  GPB offers the teacher toolkit at no cost to Georgia educators. It will be available in September 2018. To preorder your teacher toolkit, complete and submit this form to request the teacher toolkit. You only need to submit this form one time to get materials for all seven units of study.