Radioactive Decay Earth Science
Authored by Charles Martinez
Other Sciences
9th Grade
Used 2+ times
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17 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What percentage of rubidium-87 atoms will be left after four half lives?
25.0%
12.5%
6.25%
3.125%
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
How old is a bone that has 12.5% of the original amount of radioactive carbon-14 remaining?
5,700 years
11,400 years
17,100 years
22,800 years
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which radioactive isotope is most often used when determining the age of fossil bones found in sediments deposited during the Holocene Epoch?
carbon-14
potassium-40
uranium-238
rubidium-87
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Due to radioactive decay, an igneous rock sample now contains one-fourth of the amount of potassium-40 that it originally contained. The age, in years, of this rock sample is approximately
0.7 x 109 years
1.3 x 109 years
2.6 x 109 years
5.2 x 109 years
5.
MULTIPLE CHOICE QUESTION
2 mins • 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%
6.
MULTIPLE CHOICE QUESTION
2 mins • 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
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which radioactive element is used to determine the absolute age of late Pleistocene animal remains?
rubidium-87
uranium-238
potassium-40
carbon-14
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