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Starting Point-Teaching Entry Level Geoscience > ConcepTests > ConcepTest Examples > ConcepTest: Radioactive Decay
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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