Half-Life

QuizÂ by Hannah Keener

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5 questions
• Q1
The half-life of Selenium-83 is 25 minutes. How long does it take for a 100mg sample to decay to 12.5mg?
25 minutes
100 minutes
0 minutes
75 minutes
120s
• Q2
The half-life of Po-218 is 3 minutes. How much of a 2.0 gram sample remains after 12 minutes?
0.125
2
.5
.0625
120s
• Q3
The half-life of an isotope is 2 years. How many years would it take for a 4 mg sample of the isotope to decay and have only 0.50 mg of it remain?
2 years
5 years
10 years
6 years
120s
• Q4
Actinium-226 has a half-life of 29 hours. If 100 mg of actinium-226 disintegrates over a period of 58 hours, what fraction of the original actinium-226 will remain?
1/8
1/4
1/2
2
120s
• Q5
The half-life of iodine-125 is 60 days. How many half-lives will have occurred after 360 days?
2
10
6
36
120s

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