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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 24
Q

A galaxy is moving away from Earth. The “blue” hydrogen line at 434 nm emitted from the galaxy is measured on Earth to be 455 nm.

  1. How fast is the galaxy moving?
  2. How far is it from Earth based on Hubble’s law?
A
0.047c0.047c
Giancoli 7th Edition, Chapter 33, Problem 24 solution video poster
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COMMENTS
By matthewgoffena on Sun, 4/26/2015 - 10:21 PM

There is a part b to this problem. Bye the way, thank you for your videos! They have proven to be very useful in my studies.

By Mr. Dychko on Mon, 4/27/2015 - 3:50 AM

Hi matthewgoffena, thanks a lot for noticing that part b) is missing. I've flagged this solution, and will fill in the missing part some other time.

Thanks also the great feedback. I'm really pleased the videos are helping with your course!

All the best,
Mr. Dychko

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