An astronomer identifies a hydrogen emission line in the spectrum of light coming from a distant galaxy. The wavelength of the emitted light is 656 nm. The astronomer measures that the light has been redshifted by 9.54 nm. What is the -factor of the distant galaxy? Give your answer to 3 significant figures.
The Antennae galaxies are a pair of interacting galaxies that have a recessional velocity of 1,640 km/s. By how much would the 434 nm hydrogen line be redshifted in the light from these galaxies? Give your answer to 3 significant figures.
An astronomer observes the light coming from the Fireworks galaxy and identifies the 410 nm hydrogen emission line in the spectrum. The emission line has been redshifted by 0.0545 nm. What is the recessional velocity of the galaxy? Give your answer to 3 significant figures.