21st Century Astronomy 6E
21st Century Astronomy 6E
6th Edition
ISBN: 9780393690675
Author: Laura Kay, Stacy Palen, George Blumenthal
Publisher: W. W. Norton
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Chapter 17, Problem 4QP
To determine

The reason why a pulsar pulses.

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The orbit of the binary pulsar PSR 1936+16, studied by Taylor and Hulse,   a. is so small that the orbital period is smaller than the pulsar period.   b. is growing smaller, presumably by emitting gravitational waves.   c. provides evidence that it is being orbited by at least 6 planets the size of Jupiter.   d. shows large changes each time an X ray burst is emitted from the system.   e. contains a white dwarf and a black hole.
Why don’t all supernova remnants contain pulsars?   a. All supernova remnants do contain pulsars.   b. Some supernova explosions form white dwarfs instead of the neutron stars necessary for pulsars.   c. Pulsars slow down and quit producing the pulses before the supernova remnant dissipates.   d. The pulsar may be tipped so that the beams do not sweep past Earth.   e. b and c
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.
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