Radioactive Decay Review3
Quiz
•
Science
•
9th Grade
•
Practice Problem
•
Hard
Standards-aligned
Kristen Reid
Used 3+ times
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9 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How old is a fossil that has radioactively decayed through 4 half-lives of carbon-14?
5,700 years
17,100 years
22,800 years
28,500 years
Tags
NGSS.HS-PS1-8
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Radioactive carbon-14 is often useful in determining the absolute age of geologic samples because radioactive isotopes:
decay at a regular rate
become less stable during decay
remain unchanged over time
stabilize after four half-lives
Tags
NGSS.HS-PS1-8
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Radioactive dating of fossils and rocks is possible because radioactive isotopes:
are found in all fossils and rocks
are easily collected and measured
disintegrate into organic substances
disintegrate at a predictable rate
Tags
NGSS.HS-PS1-8
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What percentage of rubidium-87 atoms will be left after four half lives?
25.0%
12.5%
6.25%
3.125%
Tags
NGSS.HS-PS1-8
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which diagram represents the correct proportion of 87Rb to its decay product, 87Sr, after two half-lives?
Diagram A
Diagram B
Diagram C
Diagram D
Tags
NGSS.HS-PS1-8
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A fossil formed 11,400 years ago. Which percentage of the original amount of carbon-14 remains in the fossil?
100%
50%
25%
12.5%
Tags
NGSS.HS-ESS2-6
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many half-lives have passed if a sample contains 25% of its original carbon-14?
1 half-life
2 half-lives
3 half-lives
4 half-lives
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