Foundations of Astronomy (MindTap Course List)
14th Edition
ISBN: 9781337399920
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Textbook Question
Chapter 18, Problem 6P
You analyze a sample of a meteorite that landed on Earth and find 7/8 of the uranium-238 radioactive atoms have decayed into lead-206. What percentage of the sample are daughter isotopes and what percentage are uranium-238 radioactive atoms? What is the age of the sample? What do you conclude about the sample? (Note: The half-life of uranium-238 is 4.5 billion years.)
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A sample from a meteorite that landed on Earth has been analyzed, and the result shows that out of every 1,000 nuclei of potassium-40 originally in the meteorite, only 125 are
still present, meaning they have not yet decayed. How old is the meteorite (in yr)? (Hint: See the figure below.) (Note: The half-life of potassium-40 is 1.3 billion years.)
Figure
Graph
Bar charts
A mineral sample
containing radioactive
atoms :, which decay
into daughter atoms
100
Percentage of
radioactive and
daughter atoms
in the mineral
50
100
Percentage of
-radioactive atoms
remaining
Age in half-lives
yr
Percentage remaining
A sample from a meteorite that landed on Earth has been analyzed, and the result shows that out of every 1,000 nuclei of potassium-40 originally in the meteorite, only 125 are still present, meaning
they have not yet decayed. How old is the meteorite (in yr)? (Hint: See the figure below.) (Note: The half-life of potassium-40 is 1.3 billion years.)
Figure
Graph
Bar charts
A mineral sample
containing radioactive
atoms :, which decay
into daughter atoms ::
100
Percentage of
radioactive and
50
daughter atoms
in the mineral
100
Percentage of
50
-radioactive atoms
remaining
2
3
Age in half-lives
yr
Percentage remaining
:---1/2 remain----ER
1/4 remain---- ---:
1/8 remain-------
A sample from a meteorite that landed on Earth has been analyzed, and the result shows that out of every 1,000 nuclei of potassium-40 originally in the meteorite, only 250 are still present, meaning they have not yet decayed. How old is the meteorite (in yr)? (Hint: See the figure below.) (Note: The half-life of potassium-40 is 1.3 billion years.)
Figure
A graph and a series of bar charts above it both show the percentage of radioactive atoms remaining in a mineral sample. Detailed descriptions of the graph and the bar charts are available in the adjacent lists.
Chapter 18 Solutions
Foundations of Astronomy (MindTap Course List)
Ch. 18 - Why was the nebular hypothesis never fully...Ch. 18 - What produced the helium now present in the Suns...Ch. 18 - What produced the iron and heavier elements such...Ch. 18 - Prob. 4RQCh. 18 - What evidence can you give that disks of gas and...Ch. 18 - Why is the solar nebula theory considered a theory...Ch. 18 - According to the solar nebula theory, why is...Ch. 18 - According to the solar nebula theory, why is there...Ch. 18 - Why does the solar nebula theory predict that...Ch. 18 - What evidence can you give that the Solar System...
Ch. 18 - What planet in the Solar System is larger than the...Ch. 18 - Why is almost every solid surface in the Solar...Ch. 18 - What is the difference between condensation and...Ch. 18 - Why dont Terrestrial planets have ring systems...Ch. 18 - How does the solar nebula theory help you...Ch. 18 - Prob. 16RQCh. 18 - If rocks obtained from the Moon indicate an age of...Ch. 18 - Which is older, the Moon or the Sun? How do you...Ch. 18 - How does the solar nebula theory explain the...Ch. 18 - Did hydrogen gas condense from the nebula as the...Ch. 18 - What happens if a planet has differentiated? Would...Ch. 18 - Order the following steps in the formation of a...Ch. 18 - Which step(s) listed in the previous question can...Ch. 18 - Describe two processes that could melt the...Ch. 18 - What is the evidence that Jupiter and Saturn are...Ch. 18 - Describe two processes that cleared the solar...Ch. 18 - What is the difference between a planetesimal and...Ch. 18 - Does Uranus have enough mass to have formed by...Ch. 18 - What properties of the gas and dust disks observed...Ch. 18 - Why would the astronomically short lifetime of gas...Ch. 18 - Prob. 31RQCh. 18 - Describe three methods to find extrasolar planets.Ch. 18 - Why is the existence of hot Jupiters puzzling?...Ch. 18 - The evidence is overwhelming that the Grand Canyon...Ch. 18 - Prob. 35RQCh. 18 - If you observed the Solar System from the vantage...Ch. 18 - Venus can be as bright as apparent magnitude 4.7...Ch. 18 - What is the smallest-diameter crater you can...Ch. 18 - Prob. 4PCh. 18 - Prob. 5PCh. 18 - You analyze a sample of a meteorite that landed on...Ch. 18 - You analyze a sample of a meteorite that landed on...Ch. 18 - Prob. 8PCh. 18 - Examine Table 18-2. What might a planets...Ch. 18 - Examine Table 18-2. What might a planets...Ch. 18 - Suppose that Earth grew to its present size in 10...Ch. 18 - Prob. 12PCh. 18 - Prob. 13PCh. 18 - Prob. 1SOPCh. 18 - Prob. 2SOPCh. 18 - What do you see in this image that indicates this...Ch. 18 - Why do astronomers conclude that the surface of...Ch. 18 - Prob. 3LTLCh. 18 - Prob. 4LTL
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