Chapters 10 & 11 (The Death of Stars & Neutron Stars & Black Holes) Quiz

Chapters 10 & 11 (The Death of Stars & Neutron Stars & Black Holes) Quiz

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Astronomy 101: Chapter 10: The Death of Stars & Chapter 11: Neutron Stars and Black Holes 1. How does the main-sequence lifetime of a star compare to its entire fusion lifetime? a. Stars spend about 10% of their fusion lifetimes on the main sequence. b. Stars spend about 30% of their fusion lifetimes on the main sequence. c. Stars spend about 50% of their fusion lifetimes on the main sequence. d. Stars spend about 70% of their fusion lifetimes on the main sequence. e. Stars spend about 90% of their fusion lifetimes on the main sequence. 2. What event marks the end of every star's main-sequence life? a. The end of hydrogen fusion in the core. b. The beginning of the CNO cycle. c. The beginning of the triple-alpha process. d. The formation of a planetary nebula. e. Both a and c above. 3. Why do medium- and high-mass main-sequence stars expand to become giants and supergiants? a. The triple-alpha process begins in their cores. b. Their hydrogen core fusion rate increases. c. Iron cores form and fusion ends. d. Gravity gets weaker with time. e. Hydrogen shell fusion begins. 4. Why can the lowest-mass stars never become giants? a. They never get hot enough for the triple-alpha process. b. Their gravity is too weak to stop them from expanding beyond the giant phase. c. They live so long that none have ever left the main sequence. d. The rate of hydrogen shell fusion is too slow to cause the star to expand. e. They are fully connective and never develop a hydrogen shell fusion zone.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
5. Why does helium fusion require a higher temperature than hydrogen fusion? a. Helium nuclei have two protons, whereas hydrogen nuclei have only one proton. b. Helium nuclei have the greatest binding energy per nucleon. c. Helium nuclei are less massive than hydrogen nuclei. d.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/11/2011 for the course CH 101 taught by Professor Susanbontems during the Fall '11 term at Montgomery College.

Page1 / 6

Chapters 10 & 11 (The Death of Stars & Neutron Stars & Black Holes) Quiz

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online