21ST CENTURY ASTR.:STARS..(LL)-PACKAGE
6th Edition
ISBN: 9780393448450
Author: Kay
Publisher: NORTON
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Chapter 20, Problem 10QP
To determine
Define cosmic rays.
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20.
Gravitational lensing can be used to detect which component of the Universe?
a.
Dark Matter.
b.
Photons.
c.
Dark Energy.
d.
Electrons.
The cosmic background radiation comes from a time in the evolution of the universe
a.
when protons and neutrons were first formed.
b.
when the big bang first began to expand.
c.
that is known as the inflationary period.
d.
when gamma rays had enough energy to destroy nuclei.
e.
when electrons began to recombine with nuclei to form atoms.
4. Which of the following constituents of the Universe is present in the highest fraction in terms of its contribution to the total energy of the Universe?
a.
Dark Matter.
b.
Dark Energy.
c.
Light.
d.
Normal (baryonic) matter.
Chapter 20 Solutions
21ST CENTURY ASTR.:STARS..(LL)-PACKAGE
Ch. 20.1 - Prob. 20.1CYUCh. 20.2 - Prob. 20.2CYUCh. 20.3 - Prob. 20.3CYUCh. 20.4 - Prob. 20.4CYUCh. 20 - Prob. 1QPCh. 20 - Prob. 2QPCh. 20 - Prob. 3QPCh. 20 - Prob. 4QPCh. 20 - Prob. 5QPCh. 20 - Prob. 6QP
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- 1. Which of these is true about the Big Bang model? a. The singularity is an established, well-defined part of the model. b. Cosmic expansion stopped at some point in time. c. Part of its proof is the amounts of H and He we have in the universe today. d. The Big Bang was a big explosion that threw matter into many different directionsarrow_forwardThe first evidence for the dark energy was that: a. the cosmic microwave background spectrum was a perfect black body. b. Einstein’s theory of gravity predicted that the Universe should collapse. c. Type Ia supernovae appeared dimmer than predicted by Hubble’s law. d. Cepheid variable stars showed that galaxies were farther away that thought. e. galaxies in clusters are moving too rapidly for the clusters to be bound.arrow_forward23. The period during the early Universe in which the first atomic nuclei (not full atoms) formed is called: a. Cosmic Microwave Background. b. Inflation. c. Quantum Gravity Era. d. Big Bang Nucleosynthesis.arrow_forward
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