CHAPTER 45 - 5 - which gives d = 1.4 10 8 ly . 26. We find...

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Unformatted text preview: which gives d = 1.4 10 8 ly . 26. We find the distance from Hubbles law: v = Hd ; 3.5 10 6 m/s = [(70 10 3 m/s/Mpc)/(10 6 pc/Mpc)(3.26 ly/pc)] d , which gives d = 1.6 10 8 ly . 27. We estimate the speed of the galaxy from Hubbles law: v = Hd = [(70 10 3 m/s/Mpc)/(3.26 ly/pc)](12 10 3 Mly) = 2.6 10 8 m/s = 0.86 c . 28. ( a ) We find the receding speed of the galaxy from v = Hd = [(70 10 3 m/s/Mpc)/(3.26 ly/pc)](1.0 Mly) = 2.15 10 4 m/s = (7.2 10 5 ) c . For the Doppler shift of the wavelength we have / = {[1 + ( v / c )]/[1 ( v / c )]} 1/2 ; /(656 nm) = [(1 + 7.2 10 5 )/(1 7.2 10 5 )] 1/2 , which gives = 656 nm . ( b ) We find the receding speed of the galaxy from v = Hd = [(70 10 3 m/s/Mpc)/(3.26 ly/pc)](1.0 10 2 Mly) = 2.15 10 6...
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This note was uploaded on 09/13/2010 for the course PHYSICS 7 taught by Professor ? during the Spring '08 term at University of California, Berkeley.

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CHAPTER 45 - 5 - which gives d = 1.4 10 8 ly . 26. We find...

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