Would the atomic emission spectrum be more useful in: determining age of an artifact, a star's chemical composition, the speed of sound, or investigating DNA evidence?

Question

.sam. · Answer

I don't think so

anonymous · Answer

in which would it be more useful?

.sam. · Answer

you determine the age of an artifact by using substances such as cobolt-60, then determine the rate constant from the half life

they use spectroscopy to determine a star's chemical composition - which is basically passing light through a prism or something similar to break it down into its constituent colors. Then by looking at what colors are missing (absorption lines) we can determine both temperature and composition.
Temperature is actually the biggest determinant of what absorption lines are present 
Mostly black body radiation

.sam. · Answer

Energy spectra are often used in astrophysical spectroscopy.

anonymous · Answer

so I would think its best use it to determine a star's chemical make up...

.sam. · Answer

spectroscopy can be used to identify the elements in matter of unknown composition.

anonymous · Answer

thank you

.sam. · Answer

yw