Hydrogen produces a spectral line at 400nm. oxygen produced a spectral line at 374. If you detected a galaxy with a spectral line at 384.

Hydrogen produces a spectral line at 400nm. oxygen produced a spectral line at 374.8nm. If you detected a galaxy with a spectral line at 384.8nm what Doppler shift would you derive if you assumed it was produced by hydrogen? Please open attached photo below