The Sun will exhaust its nuclear fuel in about
A) 5000 AD.
B) 5 million years.
C) 5 billion years.
D) 50 billion years.
C) 5 billion years.
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Describe Couette flow
What will be an ideal response?
Has Polaris always been the "North Star" , also known as the "Pole Star" ?
a. No, because the Earth's axis slowly changes the direction it points. b. No, because it is a young star which formed only a few hundred years ago. c. Yes, because stars position change little over many centuries. d. No, because the Milky Way blocked our line of site to it for a long time.
A star is observed with a surface temperature of 3,000 K and a lumi nosity of 105 solar. What is the approximate radius of this star?
A) 10 solar radii B) 103 solar radii C) 102 solar radii D) The radius cannot be determined.
What causes spherical aberration?
A. the lens surface is not perfectly smooth B. the outer edges of the lens produce a focus at a different point than the central rays C. light is an electromagnetic wave with intrinsic diffraction properties D. the absorption of light in the glass is a function of wavelength