COSMIC PERSPECTIVE
9th Edition
ISBN: 9780135729458
Author: Bennett
Publisher: PEARSON
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Chapter 15, Problem 42EAP
To determine
To discuss: An observation to verify the prediction that life span of high-mass stars are shorter compared to low-mass stars.
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Based on what you learned about the source of stellar energy and how stars make energy, select all of the correct statements from the following list.
1. Many stars make energy with the proton-proton cycle.
2. The CNO cycle is more efficient than the proton-proton cycle.
3. The sun's energy comes from the CNO cycle.More massive stars make energy with the proton-proton cycle.
4. The leftover mass in both the proton-proton cycle and the CNO cycle is converted to energy.
5. A helium atom is more massive than four hydrogen atoms.
6. The CNO cycle requires a higher temperature than the proton-proton cycle.
Which of the following statements about various stages of core nuclear burning (hydrogen, helium, carbon, etc.) in a high-
mass star is not true?
A. As each stage ends, the core shrinks and heats further.
B. Each successive stage creates an element with a higher atomic number and atomic mass number.
C. As each stage ends, the reactions that occurred in previous stages continue in shells around the core.
D.Each successive stage lasts for approximately the same amount of time.
Based on what you learned about stellar evolution, select all of the correct statements from the following list.
1. The period of some Cepheid variables actually changes.
2. When getting dimmer, variable stars are releasing energy; when getting brighter they are storing energy.
3. variable stars are expanding and contracting
4. despite their variability, variable stars stay in a specific position on the H-R diagram.
5. A changing period in a Cepheid variable means that the size of the star is changing and that the star is therefore evolving.
6. Only stars on the instability strip are variable.
7. More massive stars will vary their brightness more quickly.
Chapter 15 Solutions
COSMIC PERSPECTIVE
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