•Relate continuous spectra,
emission line spectra, &
• absorption line
spectra
1.Hot opaque
solid (dense gas) emits light of all wavelengths ® continuous spectrum of radiation
2.Low density
(transparent) hot gas emits spectrum of bright emission lines
3.Low
density (transparent) cool gas in front of
a blackbody
absorbs wavelengths from the continuous spectrum ® dark absorption line spectrum on continuous spectrum (wavelengths same as emission lines from hot gas)
•Spectroscopy enables determinations of chemical structure of stars
1.