Loose Leaf For Explorations: Introduction To Astronomy
9th Edition
ISBN: 9781260432145
Author: Thomas T Arny, Stephen E Schneider Professor
Publisher: McGraw-Hill Education
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Chapter 6, Problem 5QFR
To determine
The method through which the scientists determine the age of Earth.
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Meihui is at NASA analyzing Moon rocks. In one of the rocks from the lunar highlands, he discovered 49 % of the original uranium-238 remains, while remaining amount of uranium-238 had decayed into lead. The half life of uranium-238 is 4.5 × 109 years. Assume the only decay product is lead. How old is the lunar maria rock in billions of years (109 years)?
A rock sample which originally contained 400 grams of radioactive isotope X now contains 25 grams of the material. The half-life of isotope X is 10,000 years. How old is the rock sample? (Give your answer without any punctuation or lables. For example: 15000).
Which of the following is the best way to measure the age of the Earth?
Examine rocks collected in my backyard.
Analyze maps of all known fossil sites in the United States.
Test the rate of decay of specific elements in rock samples.
Explore leaves embedded in ash from recent volcanic eruptions.
Chapter 6 Solutions
Loose Leaf For Explorations: Introduction To Astronomy
Ch. 6 - Prob. 1QFRCh. 6 - Prob. 2QFRCh. 6 - How do we know that Earth has a liquid core? Why...Ch. 6 - Prob. 4QFRCh. 6 - Prob. 5QFRCh. 6 - Prob. 6QFRCh. 6 - Prob. 7QFRCh. 6 - On what plate of the crust are you located? Which...Ch. 6 - Prob. 9QFRCh. 6 - Prob. 10QFR
Ch. 6 - Prob. 11QFRCh. 6 - How does the fact that Earth has a magnetic field...Ch. 6 - Prob. 13QFRCh. 6 - Prob. 14QFRCh. 6 - Prob. 15QFRCh. 6 - Prob. 16QFRCh. 6 - Prob. 17QFRCh. 6 - Prob. 1TQCh. 6 - Submarines contain ballast tanks that can take on...Ch. 6 - According to the Guinness Book of Mountains and...Ch. 6 - Flicking your finger against your cheek makes a...Ch. 6 - How does the eventual acceptance of the plate...Ch. 6 - If Earth rotated more slowly, would you expect it...Ch. 6 - Prob. 7TQCh. 6 - Prob. 8TQCh. 6 - Prob. 9TQCh. 6 - Suppose Earths radius were only half of its real...Ch. 6 - Prob. 2PCh. 6 - Prob. 3PCh. 6 - Prob. 4PCh. 6 - Prob. 5PCh. 6 - Prob. 6PCh. 6 - Prob. 7PCh. 6 - Prob. 8PCh. 6 - Prob. 1TYCh. 6 - Prob. 2TYCh. 6 - Prob. 3TYCh. 6 - Prob. 4TYCh. 6 - Prob. 5TYCh. 6 - Prob. 6TYCh. 6 - Prob. 7TYCh. 6 - Prob. 8TYCh. 6 - Prob. 9TYCh. 6 - Prob. 1EQFRCh. 6 - Prob. 2EQFRCh. 6 - Prob. 3EQFRCh. 6 - Prob. 4EQFRCh. 6 - Prob. 5EQFRCh. 6 - Prob. 6EQFRCh. 6 - Prob. 7EQFRCh. 6 - Prob. 1ETQCh. 6 - Prob. 2ETQCh. 6 - Prob. 3ETQCh. 6 - Prob. 4ETQCh. 6 - Prob. 5ETQCh. 6 - Prob. 1EPCh. 6 - Prob. 2EPCh. 6 - Prob. 3EPCh. 6 - Prob. 4EPCh. 6 - Prob. 1ETYCh. 6 - Prob. 2ETYCh. 6 - Prob. 3ETYCh. 6 - Prob. 4ETY
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- Describe how we use radioactive elements and their decay products to find the age of a rock sample. Is this necessarily the age of the entire world from which the sample comes? Explain.arrow_forwardIf the half-life of a radioactive specimen is 100 years, then how long will it take for the specimen to reach 25% of its original amount? (24.3) (a) 25 years (b) 50 years (c) 100 years (d) 200 yearsarrow_forwardA radioactive nucleus has a half-life of 5108 years. Assuming that a sample of rock (say, in an asteroid) solidified right after the solar system formed, approximately what fraction of the radioactive element should be left in the rock today?arrow_forward
- Given that the half-life of carbon-14 is 5,730 years. Consider a sample of fossilized wood that when alive, would have contained 24 gm of carbon-14. It now contains 1.5 gm of carbon-14. How old is the sample?arrow_forwardAn artifact was found and tested for its carbon-14 content. If 89% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? (Carbon-14 has a half-life of 5,730 years.)arrow_forwardIn a certain rock, the ratio of lead atoms to uranium atoms is 0.300.Assume that uranium has a half-life of 4.47 × 10^9 y and that the rock had no lead atoms when it formed. How old is the rock?arrow_forward
- a parent isotope has a half-life of 500,000 years. if a rock contained 10mg of the parent isotope when it formed, how much parent isotope would be left after 1.5 million years?arrow_forwardWhich is evidence that supports the dynamo theory? A) Earth's outer core contains liquid that conducts electricity B) Earth's core contains a large amount of iron C) Granite and basalt conduct electricity D) Convection occurs in Earth's inner corearrow_forward
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