M and M Half-Life
Name ______________________
Question: What is the half-life of a radioactive substance?
Hypothesis:
Procedure:
Data:
Total number of atoms (M and M’s) ______________
Half
Lives
Atoms decayed
(M not showing)
Radioactive atoms
(M showing)
Time
1
2
3
4
5
6
7
8
9
10
11
12
Graph
1. Minutes vs. radioactive atoms
2. Draw the curve that fits the data
3. How long did it take1/2 of the radioactive atoms to decay?
(place on graph as T1/2 = _____ minutes)
Conclusion
1.What does half-life of a radioactive isotope mean?
2. When a radioactive substance decays does it just disappear? What happens to it?
3. If you started with 1000 radioactive m and m’s how long would it take to get to only
having 500 radioactive m and m’s left?
4. If you started with 60 grams of radioactive m and m’s how long would it take to get to
15 grams of radioactive m and m’s
5. The half life of cobalt-60 is 10.47 min. How many milligrams of cobalt -60 remain
after 104.7 min if you started with 10.0 mg?
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