Radioactivity and Half-Life
Authored by Lisa Thompson
Science
9th Grade
NGSS covered
Used 3+ times
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15 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
How many half-lives does it take a radioactive substance to decay until only one-eighth (1/8) of the original substance remains.
2
3
6
8
Tags
NGSS.HS-PS1-8
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Sodium-24 has a half-life of approximately 15 hours. If only one-eighth of the sodium-24 remains, about how much time has passed.
15 hours
30 hours
45 hours
60 hours
Tags
NGSS.HS-PS1-8
3.
MULTIPLE SELECT QUESTION
1 min • 1 pt
Cerium-143 is a radioactive isotope that decays to produce praseodymium-143. The half-life for cerium-143 is approximately 33 hours. If 6.25 g cerium-143 remains from a 100-g sample, which statement is true? Select all that apply.
Cerium-143 decayed for 132 hours.
Cerium-143 decayed for 166 hours.
Two half-lives have passed.
Three half-lives have passed.
Four half-lives have passed.
Tags
NGSS.HS-PS1-8
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The graph shows the radioactive decay of a bone that is found to contain 1/8 of the carbon-14 found in living animals today.
5,790 years
11,460 years
17,190 years
22,920 years
Tags
NGSS.HS-PS1-8
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which statement best describes what happens in a fission reaction?
Light nuclei form into heavier nuclei.
Heavy nuclei split into lighter nuclei.
Energy is released, and less stable elements are formed.
Energy is absorbed, and more stable elements are formed.
Tags
NGSS.HS-PS1-8
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The amount of time it takes for half the nuclei in a sample of the isotope to decay is...
Half-Life
Radioactivity
Nuclear Fission
Nuclear Fusion
Tags
NGSS.HS-PS1-8
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
If the half-life of 100 grams of a radioactive isotope is 8 years, how many grams will remain in 32 years?
50g
6.25g
25g
12.5g
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