Understanding Our Universe
Understanding Our Universe
3rd Edition
ISBN: 9780393614428
Author: PALEN, Stacy, Kay, Laura, Blumenthal, George (george Ray)
Publisher: W.w. Norton & Company,
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Chapter 12, Problem 10QAP
To determine

The property of accretion disk.

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As a white dwarf cools, its radius will not change because   a. pressure resulting from nuclear reactions in a shell just below the surface keeps it from collapsing.   b. pressure does not depend on temperature for a white dwarf because the electrons are degenerate.   c. pressure does not depend on temperature because the white dwarf is too hot.   d. pressure does not depend on temperature because the star has exhausted all its nuclear fuels.   e. material accreting onto it from a companion maintains a constant radius.
When a mass is transferred through the inner Lagrangian point in a binary system toward a white dwarf, the material forms a rapidly growing whirlpool of material known as a(n)   a. accretion disk.   b. Lagrangian point.   c. Algol paradox.   d. planetary nebula.   e. supernova remnant.
What is the size of a typical white dwarf? Group of answer choices   1.0 solar radii   0.5 solar radii   0.1 solar radii (roughly the size of Jupiter)   0.01 solar radii (roughly the size of Earth)   5 solar radii
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