1. What is half-life?
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Half-life Practice
1. What is half-life?
2. If we start with 400 atoms of a radioactive substance, how many would we have after:
a. one half-life?
b. two half-lives?
c. three half-lives?
d. four half-lives?
3. If we start with 48 atoms of a radioactive substance, how many would remain after:
a. one half-life?
b. two half-lives?
c. after three half-lives?
d. after four half-lives?
Using the graph to the right, answer
the following questions.
4. What is the half-life of each element?
5. Which element has the shortest half-life?
10-
6. Which element is the most unstable? How
do you know?
Ago 10 years )
Use the graph on the to answer the following questions.
7. How many atoms are in the original sample size of this
radioisotope?
8. How long is the half-life?
9. How many atoms are left after 2 half-lives?
10. Approximately how many days would have to pass for
there to be only 2.5 atoms of the sample remaining? How
many half-lives?
Parcent ot Oniginal Mase Romaining
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