Universe: Stars And Galaxies
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 6, Problem 39Q
To determine

(a)

The diameter of the smallest detail that can be discerned in the HST image of M100 galaxy.

To determine

(b)

Distance of the U.S. dime in km for given angular size.

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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?
For a human eye with a pupil diameter (aperture diameter D) of 0.005 meters, and a focal length of 0.022 meters, there will be a resolution limit due to diffraction at 0.6 microns (10^-6 meters) wavelength. If we space light-sensitive cells on the retina at this spacing, how many retina cells per meter (of retina) are there? cells/meter. Now suppose there are giants which are exactly twice the size of humans in each dimension. So giant eyes have pupils of 0.01 meters, and a focal length of 0.044 meters. How many retina cells per meter should the giants have? cells/meter
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