Half Life Practice Problems

QuizÂ by Wanda Rice

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5 questions
• Q1
What is the half-life of a 50 g sample of nitrogen-16 that decays to 6.25 g in 21.6 seconds?
64.8 seconds
21.6 seconds
3 seconds
7. 2 seconds
30s
• Q2
If a 200 g sample of technetium-99 decays to 12.5 g in 852,000 years, what is its half-life?
852,000 years
3,408,000 years
213,000 years
4 years
30s
• Q3
A 50 g sample of iodine-131 sample decays to 6.25 g, how many half-lives have passed?
3
2
1
4
30s
• Q4
What percent of hafnium-156 remains undecayed , if a 50 g sample decays to 6.25 g?
25%
50%
87.5%
12.5%
30s
• Q5
Chromium-48 has a half-life of 21.6 hours, how much of the sample has decayed after 108 hours if the beginning mass was 360 g?
15/16
.125
1/8
1/16
30s

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