27. We apply Eq. 37-36 for the Doppler shift in wavelength: ∆λλ=vcwhere vis the recessional speed of the galaxy. We use Hubble’s law to find the recessional speed: v = Hr, where ris the distance to the galaxy and His the Hubble constant ()3msly21.8 10.−⋅×Thus, 386m21.8 102.40 10 ly5.23 10 m sv−⋅ªº=×
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This note was uploaded on 01/23/2011 for the course ＰＨＹ 214 taught by Professor Timothybolton during the Fall '10 term at Kansas State University.