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Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
33
Astrophysics and Cosmology
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33-1 to 33-3: Stars, Galaxies, Stellar Evolution, Distances
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33-4: General Relativity, Gravity and Curved Space
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33-5: Redshift, Hubble's Law
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33-6 to 33-8: The Big Bang, CMB, Universe Expansion
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33-9: Dark Matter, Dark Energy
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Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 36
Q

The scale factor of the universe (average distance between galaxies) at any given time is believed to have been inversely proportional to the absolute temperature. Estimate the size of the universe, compared to today, at

  1. t=106 yrt = 10^6 \textrm{ yr},
  2. t=1 st = 1 \textrm{ s},
  3. t=10−6 st = 10^{-6} \textrm{ s}, and
  4. t=10−35 st = 10^{-35} \textrm{ s},
A
  1. 3×107 ly3 \times 10^7 \textrm{ ly}
  2. 3 ly3 \textrm{ ly}
  3. 0.03 ly0.03 \textrm{ ly}
  4. 0.3 m0.3 \textrm{ m}
Giancoli 7th Edition, Chapter 33, Problem 36 solution video poster
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