ConcepTest: Radioactive Decay
This material was originally created for
Starting Point:Introductory Geology and is replicated here as part of the SERC Pedagogic Service.
Initial Publication Date: May 8, 2006
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
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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