Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Chapter 25, Problem 5TYK
Summary Introduction
Introduction: The half-life is defined as the time required for an amount to decrease to half of the value that is initially present. The actual ages of fossils and rocks are determined by radiometric dating. Every radioactive isotope has a rate of decay that is fixed. Its half-life is the number of years that occurs for 50 percentage of an isotope of the “parent” to decay.
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This was one of Galileo’s observations?
A. Venus goes through phases
B. Our sun orbits the center of our galaxy
C. The orbit of Jupiter is an ellipse
D. Four Moons orbit Venus
E. The moon rotates
Suppose a scientist finds a rock with an interesting fossil. Curious to know the age of the fossil, she takes the rock to a lab. The
lab determines the amount of rubidium (Rb) and strontium (Sr) in the rock. The scientist is familiar with radiometric dating and
knows that she can now calculate the age of the rock, 1, using an isochron. The Rb-Sr isochron equation is
87.
Rb.
[edr – 1]
86
°Sr.
87
87
Sro
86
Sro
86
Sr.
87.
Rb
3.807 and
89.60. In a published table, she finds that
Using the lab's values, she calculates the isotope ratios as
86
Sr.
87
= 0.7129. She also finds that the decay constant,
86
the ratio of strontium-87 to strontium-86 at the formation of the rock was
Sro
2, for rubidium-87 is 1.42 x 10-11.
Use the equation and provided data to calculate t. Put your answer in scientific notation and round to the nearest tenth.
years
x10
What is the approximate age of the rock in billions of years? Round to the nearest tenth.
billions of years
t =
Give written answer with explanation and conclusion
A methodology that measures the intensity of light that passes through a solution of ag-ab complexes at a 90°angle from the light source is called:
A. Spectrophotometry
B. Fluorometry
C. Turbidimetry
D. Nephelometry
Chapter 25 Solutions
Study Guide for Campbell Biology
Ch. 25 - Why do we say that, for life to have begun, the...Ch. 25 - Prob. 2IQCh. 25 - Prob. 3IQCh. 25 - Prob. 4IQCh. 25 - Prob. 5IQCh. 25 - a. Mammals originated 180 mya but did not change...Ch. 25 - Prob. 7IQCh. 25 - a. According to the model of species selection,...Ch. 25 - Prob. 1SYKCh. 25 - Label the eons, eras, and key events shown on the...
Ch. 25 - Describe three major processes that have...Ch. 25 - Prob. 4SYKCh. 25 - The primitive atmosphere of Earth may have favored...Ch. 25 - Prob. 2TYKCh. 25 - Prob. 3TYKCh. 25 - The half-life of carbon-14 is 5,730 years. A...Ch. 25 - Prob. 5TYKCh. 25 - Prob. 6TYKCh. 25 - Prob. 7TYKCh. 25 - Look back at the Geologic Record in Table 25.1....Ch. 25 - Prob. 9TYKCh. 25 - According to the endosymbiont theory, a. the first...Ch. 25 - Prob. 11TYKCh. 25 - Prob. 12TYKCh. 25 - Prob. 13TYKCh. 25 - Prob. 14TYKCh. 25 - Prob. 15TYKCh. 25 - Prob. 16TYKCh. 25 - Prob. 17TYKCh. 25 - What is meant by the concept of species selection?...
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