Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 25, Problem 10Q
To determine
The explanation for the way in which redshift can be used as a measure of lookback time and the way in which it is superior to time measured in years.
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Students have asked these similar questions
The temperature of the CMB today is
T=2.725 K. Calculate the temperature of
the CMB at redshift z=2000. Choose the
option below that most closely matches
your answer.
Select one:
O a. 9759 K
O b. 3412 K
Ос.
5453 K.
O d. 5450K
Ое. 2000 К
Assuming that hydrogen fusion requires
the Universe to have a temperature of
T > 10' K (as measured by the CMB),
determine the redshift at which the
fusion of hydrogen into helium was just
possible as the Universe expanded and
cooled. Choose the option below that
most closely matches your answer.
Select one:
Оа.
4000.87
b.
3669723.77
О с
2229723.71
O d. 9748293.14
O e.
4669723.16
The Andromeda Galaxy, M31, is the closest large spiral Galaxy to our Milky Way. When we lookat its chemical spectrum, we see that it's hydrogen alpha emission line has an observed wavelength of 655nm.
a. Calculate z, being careful with the sign
b. How fast is it moving in km/s
c. Is it redshifted or blueshifted? Is it moving toward or away from us?
Chapter 25 Solutions
Universe
Ch. 25 - Prob. 1CCCh. 25 - Prob. 2CCCh. 25 - Prob. 3CCCh. 25 - Prob. 4CCCh. 25 - Prob. 5CCCh. 25 - Prob. 6CCCh. 25 - Prob. 7CCCh. 25 - Prob. 8CCCh. 25 - Prob. 9CCCh. 25 - Prob. 10CC
Ch. 25 - Prob. 11CCCh. 25 - Prob. 12CCCh. 25 - Prob. 13CCCh. 25 - Prob. 14CCCh. 25 - Prob. 15CCCh. 25 - Prob. 1CLCCh. 25 - Prob. 2CLCCh. 25 - Prob. 3CLCCh. 25 - Prob. 4CLCCh. 25 - Prob. 1QCh. 25 - Prob. 2QCh. 25 - Prob. 3QCh. 25 - Prob. 4QCh. 25 - Prob. 5QCh. 25 - Prob. 6QCh. 25 - Prob. 7QCh. 25 - Prob. 8QCh. 25 - Prob. 9QCh. 25 - Prob. 10QCh. 25 - Prob. 11QCh. 25 - Prob. 12QCh. 25 - Prob. 13QCh. 25 - Prob. 14QCh. 25 - Prob. 15QCh. 25 - Prob. 16QCh. 25 - Prob. 17QCh. 25 - Prob. 18QCh. 25 - Prob. 19QCh. 25 - Prob. 20QCh. 25 - Prob. 21QCh. 25 - Prob. 22QCh. 25 - Prob. 23QCh. 25 - Prob. 24QCh. 25 - Prob. 25QCh. 25 - Prob. 26QCh. 25 - Prob. 27QCh. 25 - Prob. 28QCh. 25 - Prob. 29QCh. 25 - Prob. 30QCh. 25 - Prob. 31QCh. 25 - Prob. 32QCh. 25 - Prob. 33QCh. 25 - Prob. 34QCh. 25 - Prob. 35QCh. 25 - Prob. 36QCh. 25 - Prob. 37QCh. 25 - Prob. 38QCh. 25 - Prob. 39QCh. 25 - Prob. 40QCh. 25 - Prob. 41QCh. 25 - Prob. 42QCh. 25 - Prob. 43QCh. 25 - Prob. 44QCh. 25 - Prob. 45QCh. 25 - Prob. 46QCh. 25 - Prob. 47QCh. 25 - Prob. 48QCh. 25 - Prob. 49QCh. 25 - Prob. 50QCh. 25 - Prob. 51QCh. 25 - Prob. 52QCh. 25 - Prob. 53QCh. 25 - Prob. 54QCh. 25 - Prob. 55Q
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- The wavelength of a photon has been redshifted from 495 nm to 505 nm.What is the Redshift of the photon? What is the velocity of the photon source in both SI and US units? (2separate answers to 2 decimal places)arrow_forward1 Mass and Energy Use the equivalence of energy and rest mass, E = mc² to answer the following questions. (a) The total electrical energy generated in the United States is on the order of 10¹2 kWh per year. How much mass is this equivalent to? (b) The earth's orbital radius is about 1.5 x 10¹¹ m. At this distance from the sun, the energy flux of sunlight is about 1.4kW/m². How much mass does the sun radiate as light in one second? (c) A student pedaling a bicycle full throttle produces about one-half horsepower of useful power. (1 hp is equivalent to 746 W.) The human body is about 25 percent efficient: 75 percent of the food burned is converted to heat and 25 percent is converted to useful work. How long will the student have to ride to lose one pound by conversion of mass to energy? How come you do not have to exercise this long to lose a pound?arrow_forwardProblem 2. The redshift is defined to be the quantity Job – Xem Xem where Aob and Aem are respectively the wavelengths at which radiation is observed and emitted. 1. Find the corresponding definition in terms of observed and emitted frequencies fob and fem. 2. The observed frequency of radio waves from a distant galaxy is 5 GHz. At the location of galaxy, the frequency is 6 GHz. Calculate the redshift of the galaxy. 3. If the galaxy was 500 Mpc away from the Milky way when the radio waves were emitted. How far away is this galaxy today?arrow_forward
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