ConcepTest: Radioactive Decay
ConcepTest questions by
David McConnell ,
David Steer , Walter Borowski, Jeffrey Dick, Annabelle Foos, Jeffrey Knott, Alvin Konigsberg, Michelle Malone, Heidi McGrew, Kathie Owens, and Stephen Van Horn
Question:
If radioactive decay began with 400,000 parent atoms, how many would be left after 3 half lives?
a. 200,000
b. 100,000
c. 50,000
d. 25,000
Student Responses:
No data yet. The correct response is c.
If you would like to help acquire more Before and After statistics for this example, please contact the authors (see link at top of page).
References and Notes:
Subject
Geoscience:Geology:Geochemistry
Resource Type
Activities:Classroom Activity:Short Activity:ConcepTests
Grade Level
College Lower (13-14):Introductory Level
Ready for Use
Ready to Use
Earth System Topics
Time/Earth History,
Solid Earth:Earth Materials:Elements
Topics
Solid Earth:Geochemistry
Theme
Teach the Earth:Teaching Environments:Intro Geoscience,
Teach the Earth:Course Topics:Geochemistry
