An astronomer who is studying the light from a galaxy has identified the spectrum of hydrogen but finds that the wavelengths are somewhat shifted from those tound in the laboratory. In the lab, the H,, line in the hydrogen spectrum has a wavelength of 656.3 nm. The astronomer is using a transmission diffraction grating having 5608 lines/cm in the first order and finds that the first bright fringe for the H, line occurs at + 23.41" from the central spot. How fast is the galaxy moving? Express your answer In m/a and as a percentage of the speed of light. Is the galaxy moving toward us or away from us? Part C Find the wavelength of the Ha spectral line in the reccived light. Express your answer with the sppropriate units. > Viow Available Hint(s) AR = Value Units Submit Part D Rewrite the equation of Doppler effect as a formula for the velocity v of the galaxy in terms of the received wavelength and the wavelength emitted by the source. Express your answer in terms of the emitted wavelength As, the velocity of the source v, and the speed of light c. View Available Hint(s) ? AR =