21st Century Astronomy: The Solar System (Sixth Edition)
6th Edition
ISBN: 9780393691283
Author: Laura Kay; Stacy Palen; George Blumenthal
Publisher: W. W. Norton
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Chapter 19.3, Problem 19.3CYU
To determine
Astronomers detect dark matter from which of the given options.
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The fact that many radio lobes emit less intensely on the side of the galaxy facing away from Earth suggests that
a.
they are formed by material falling into the galaxy.
b.
they are powered by black body radiation.
c.
they are excited by radiation from nearby galaxies.
d.
they are powered by the rapid rotation of the galaxy.
e.
they are created by jets of high-speed matter in magnetic fields, which tend to emit photons in the direction they are moving.
Quasi-stellar objects were first detected as
a.
double-lobed spiral galaxies.
b.
faint points of light with peculiar emission spectra.
c.
large regions of X-ray emissions.
d.
starlike objects with normal stellar emission spectra.
e.
galaxies with normal stellar emission spectra.
The supermassive black hole at the center of a galaxy has a mass of 6.5 billion solar masses. If we assume that it is a Schwarzschild black hole, what is the radius of this black hole?
A. 18 light hours
B. 20 light hours
C. 16 light hours
D. 14 light hours
Is the answer A?
S. radius = 3 x 6.5 x 109 x 9.26567-10 = 18.1 light hours
Thanks!
Chapter 19 Solutions
21st Century Astronomy: The Solar System (Sixth Edition)
Ch. 19.1 - Prob. 19.1ACYUCh. 19.1 - Prob. 19.1BCYUCh. 19.2 - Prob. 19.2CYUCh. 19.3 - Prob. 19.3CYUCh. 19.4 - Prob. 19.4CYUCh. 19 - Prob. 1QPCh. 19 - Prob. 2QPCh. 19 - Prob. 3QPCh. 19 - Prob. 4QPCh. 19 - Prob. 5QP
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