The application of spectroscopy from the list given is : (B). determining the distance and velocity of galaxies
Spectroscopy is the branch of science, designed to investigate and measure the amount of spectra that is produced when a matter emits electromagnetic radiation or interacts with electromagnetic radiation.
Spectroscopy can also be said to mean the study of matters radiation or light emission and absorption
In conclusion. the application of spectroscopy is determining the distance and velocity of galaxies
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