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+//Example 28.5
+u=0.825;//Speed at which the galaxy is moving away from the Earth (in terms of c)
+lambda_s=0.525;//Wavelength of radio waves (m)
+c=1;//Speed of light (in terms of c)
+lambda_obs=lambda_s*sqrt((1+u/c)/(1-u/c));//Wavelength detected on the Earth (m)
+printf('Wavelength of radio waves detected on the Earth = %0.2f m',lambda_obs)
+//Openstax - College Physics
+//Download for free at http://cnx.org/content/col11406/latest