Question: The Expanding Universe a cosmologist who is studying the light from a galaxy bas identified the spectrum of hydrogen but finds that the wavelengths are

The Expanding Universe a cosmologist who is studying the light from a galaxy bas identified the spectrum of hydrogen but finds that the wavelengths are somewhat shifted from those found in the laboratory. In the lab, the Ha line bas a wavelength of 656.3 nm. The cosmologist is using a transmission diffraction grating having 5758 lines/cm in the first order and finds that the first bright fringe for the Ha line occurs at ± 23.41o from the central spot. How fast is the galaxy moving? Express your answer in m/s and as a percentage of the speed of light. Is it moving toward us or away from us?

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