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 22, Problem 30Q
To determine
The reason, the spiral arms were particularly prominent in photographs taken using film that was most sensitive to blue light.
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Quasars, an abbreviation for quasi-stellar radio sources, are distant objects that look like stars through a telescope but that emit far more electromagnetic radiation than an entire normal galaxy of stars. An example is the bright object below and to the left of center in Fig; the other elongated objects in this image are normal galaxies. The leading model for the structure of a quasar is a galaxy with a supermassive black hole at its center. In this model, the radiation is emitted by interstellar gas and dust within the galaxy as this material falls toward the black hole. The radiation is thought to emanate from a region just a few light-years in diameter. (The diffuse glow surrounding the bright quasar shown in Fig. is thought to be this quasar’s host galaxy.) To investigate this model of quasars and to study other exotic astronomical objects, the Russian Space Agency has placed a radio telescope in a large orbit around the earth. When this telescope is 77,000 km from earth and the…
The 300 m diameter Arecibo radio telescope is observing the Andromeda galaxy at a wavelength of 14 cm.
Part (a) What is the angle between two just-resolvable stars for this telescope in radians?
Part (b) How close together could these point sources be at the 2.5 million light year distance of the Andromeda galaxy in ly?
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Calculate the surface area
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Chapter 22 Solutions
Universe: Stars And Galaxies
Ch. 22 - Prob. 1QCh. 22 - Prob. 2QCh. 22 - Prob. 3QCh. 22 - Prob. 4QCh. 22 - Prob. 5QCh. 22 - Prob. 6QCh. 22 - Prob. 7QCh. 22 - Prob. 8QCh. 22 - Prob. 9QCh. 22 - Prob. 10Q
Ch. 22 - Prob. 11QCh. 22 - Prob. 12QCh. 22 - Prob. 13QCh. 22 - Prob. 14QCh. 22 - Prob. 15QCh. 22 - Prob. 16QCh. 22 - Prob. 17QCh. 22 - Prob. 18QCh. 22 - Prob. 19QCh. 22 - Prob. 20QCh. 22 - Prob. 21QCh. 22 - Prob. 22QCh. 22 - Prob. 23QCh. 22 - Prob. 24QCh. 22 - Prob. 25QCh. 22 - Prob. 26QCh. 22 - Prob. 27QCh. 22 - Prob. 28QCh. 22 - Prob. 29QCh. 22 - Prob. 30QCh. 22 - Prob. 31QCh. 22 - Prob. 32QCh. 22 - Prob. 33QCh. 22 - Prob. 34QCh. 22 - Prob. 35QCh. 22 - Prob. 36QCh. 22 - Prob. 37QCh. 22 - Prob. 38QCh. 22 - Prob. 39QCh. 22 - Prob. 40QCh. 22 - Prob. 41QCh. 22 - Prob. 42QCh. 22 - Prob. 43QCh. 22 - Prob. 44QCh. 22 - Prob. 45QCh. 22 - Prob. 46QCh. 22 - Prob. 47QCh. 22 - Prob. 48QCh. 22 - Prob. 49QCh. 22 - Prob. 50Q
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- Another known cause of red shift in light is the source being in a high gravitational field. Discuss how this can be eliminated as the source of galactic red shifts, given that the shifts are proportional to distance and not to the size of the galaxy.arrow_forwardin the Cauchy equation if A=1.574 and B=0.0159µm^2 and n=1.642, the wavelength is . 0.4853μm O 485.3nm 438.5nm 0.4385μm 483.5nm O 438.5µmarrow_forwardThe Andromeda galaxy lies about 2.5 million light-years away. To what distances do the angular resolutions of SST (3") correspond at that distance?arrow_forward
- On a clear evening during the winter months, if you look up at the sky, you can see the constellation Orion (The Hunter). One star is this constellation Rigel, flickers in a blue color (λ = 400 nm), and another star, Betelgeuse, has a reddish color (λ = 750 nm). What is the difference of the surface temperature for these two stars?arrow_forwardQuestion 5: Explain why o(7) = Aelk* describes a plane wave: What is the meaning of A and k ? What is the shape of the wave fronts? What about the intensity of the plane wave for each point ř in space?arrow_forwardProblem 3: Two stars, M and N, from the same galaxy (at the same distance from earth) are observed to have the same luminosity (that is, they emit the same amount of energy per unit time). Star M is red, its spectrum peaks 2.4 × 1015s-1 while star N is white, its spectrum peaks at w = 3.6 x 1015s-1. Assuming that both stars radiate as black body, what is the at w = ratio of their radii?arrow_forward
- You walk into Foxwoods and walk to the Roulette wheel. A friend happens to be sitting there and informs you that black has come up an unprecedented 100x’s. On a roulette wheel there is 60 black and 60 red slots (green also but let’s make it simple!). You have $100 burning a hole in your pocket. Which color would you bet on and why?arrow_forwardJustify “The Debye’s continuum model is valid for long wavelengths onlyarrow_forwardA circular tablet with a radius of 20 cm and a uniform luminosity of 10.5 cd / m ^ 2 illuminates a small flat surface with an area of 1 cm ^ 2 and at a distance of 1 m from the center of the tablet. The orientation of this small surface is such that its perpendicular to the line joining the centers of the two surfaces forms an angle of 45 °. This line is perpendicular to the circular disk. Determine the luminous flux on a small surfacearrow_forward
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