ConcepTest: Radioactive Decay
This material was originally created for
Starting Point:Introductory Geology and is replicated here as part of the SERC Pedagogic Service.
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.
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).
