Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 25, Problem 49Q
To determine
The ways in which colder and warmer spots developed due to the compressions and rarefactions in the CMB. The reason for the type of temperature variation for the respective effect.
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Imagine that you are observing the light from a distant star that is located in a galaxy 100 million lightyears
away from you. By analysis of the starlight received, you are able to tell that the image we see is of a 10-
million-year-old star. You are also able to predict that the star will have a total lifetime of 50 million years, at
which point it will end in a catastrophic supernova.
a) How old does the star appear to be to us here on Earth now?
b) How long will it be before we receive the light from the supernova event?
c) Has the supernova already occurred? If so, when did it occur?
(Astronomy)
PSR1913+16 Problem II. Using only the Figure, what are the maximum radial velocities as found from the redshift and blueshift, respectively? Note: redshifts have positive radial velocities values in the figure, whereas blueshifts have negative radial velocity values.
(Answer in km/s)
Two students in a science club argue with each other regarding the concept of Redshift.
The statements made by the students are given as follows:
Student 1: When the absorption maxima shift towards longer wavelengths then it is called
the Redshift.
Student 2: The decrease in wavelength due to the Doppler effect is known as the
Redshift.
Which of the above statement/s is/are correct?
(a) Both student 1 and student 2 are true.
(b) Only student 1 is true.
(c) Only student 2 is true.
(d) Both student 1 and student 2 are false.
Chapter 25 Solutions
Universe: Stars And Galaxies
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