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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.

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References and Notes: