UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
11th Edition
ISBN: 9781319278670
Author: Freedman
Publisher: MAC HIGHER
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Chapter 24, Problem 31Q
To determine
The reason why the redshifts of absorption lines of a quasar have smaller values than those of its emission lines.
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Give the peak wavelengths, λpeak, for each of the following cases. State which portion of the electromagnetic spectrum it falls within.
A quasar, with T = 1.0 × 105 K. (In nm.)
If a quasar has a recessional velocity of 2.7 × 10 5 km/sec and is determined to be 3600 Mpc, what is the Hubble constant based on this quasar alone?
a.
50 km/sec/Mpc
b.
9.7 × 108 km/sec/Mpc
c.
75 km/sec/Mpc
d.
0.013 km/sec/Mpc
e.
273,600 km/sec/Mpc
What is the mechanism for the energy output of quasars?
Chapter 24 Solutions
UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
Ch. 24 - Prob. 1CCCh. 24 - Prob. 2CCCh. 24 - Prob. 3CCCh. 24 - Prob. 4CCCh. 24 - Prob. 5CCCh. 24 - Prob. 6CCCh. 24 - Prob. 7CCCh. 24 - Prob. 8CCCh. 24 - Prob. 9CCCh. 24 - Prob. 1CLC
Ch. 24 - Prob. 1QCh. 24 - Prob. 2QCh. 24 - Prob. 3QCh. 24 - Prob. 4QCh. 24 - Prob. 5QCh. 24 - Prob. 6QCh. 24 - Prob. 7QCh. 24 - Prob. 8QCh. 24 - Prob. 9QCh. 24 - Prob. 10QCh. 24 - Prob. 11QCh. 24 - Prob. 12QCh. 24 - Prob. 13QCh. 24 - Prob. 14QCh. 24 - Prob. 15QCh. 24 - Prob. 16QCh. 24 - Prob. 17QCh. 24 - Prob. 18QCh. 24 - Prob. 19QCh. 24 - Prob. 20QCh. 24 - Prob. 21QCh. 24 - Prob. 22QCh. 24 - Prob. 23QCh. 24 - Prob. 24QCh. 24 - Prob. 25QCh. 24 - Prob. 26QCh. 24 - Prob. 27QCh. 24 - Prob. 28QCh. 24 - Prob. 29QCh. 24 - Prob. 30QCh. 24 - Prob. 31QCh. 24 - Prob. 32QCh. 24 - Prob. 34Q
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- Describe the arguments supporting the idea that quasars are at the distances indicated by their redshifts.arrow_forwardIf a quasar has a redshift of 3.3, at what fraction of the speed of light is it moving away from us?arrow_forwardDescribe the process by which the action of a black hole can explain the energy radiated by quasars.arrow_forward
- In the chapter, we discussed that the largest redshifts found so far are greater than 6. Suppose we find a quasar with a redshift of 6.1. With what fraction of the speed of light is it moving away from us?arrow_forwardThe hypervelocity star S5HVS1 has a redshifted Hβ line (rest wavelength of486.135 nm) observed at 487.784 nm. How fast is it traveling radially awayfrom the Earth?arrow_forwardIf Hubble’s constant is taken to be 70 km/sec/Mpc, and a quasar is found with a radial velocity of 0.95 times the speed of light (3 × 10 5 km/s), how far away is the quasar? a. 4100 Mpc b. 0.014 Mpc c. 67 Mpc d. 74 Mpc e. 300,000 Mpcarrow_forward
- Imagine that an observed distant galaxy is measured to have a distance of 40 Mpc by a Type Ia supernovae and the redshift of the galaxy indicates the galaxy appears to be moving away from us at a speed of 2400 km/s. What would the Hubble constant be if measured solely based on this galaxy in units of km/s/Mpc?arrow_forwardThe temperature of the CMB today is T=2.725 K. Calculate the temperature of the CMB at redshift z=2000arrow_forwardSuppose you have obtained spectra of several galaxies and have measuerd the observed wavelength of the H-Alpha line (rest wavelength = 656.3 nm) to be Galaxy 1: 658.1 nm. Galaxy 2: 667.1 nm. Galaxy 3: 677.6 nm. Calculate the redshift, z, for each galaxy.arrow_forward
- Suppose you were Hubble and Humason, working on the distances and Doppler shifts of the galaxies. What sorts of things would you have to do to convince yourself (and others) that the relationship you were seeing between the two quantities was a real feature of the behavior of the universe? (For example, would data from two galaxies be enough to demonstrate Hubble’s law? Would data from just the nearest galaxies-in what astronomers call “the Local Group”-suffice?)arrow_forwardWhat are the advantages and disadvantages of using quasars to probe the early history of the universe?arrow_forwardRapid variability in quasars indicates that the region in which the energy is generated must be small. You can show why this is true. Suppose, for example, that the region in which the energy is generated is a transparent sphere 1 light-year in diameter. Suppose that in 1 s this region brightens by a factor of 10 and remains bright for two years, after which it returns to its original luminosity. Draw its light curve (a graph of its brightness over time) as viewed from Earth.arrow_forward
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