HW#10: pg. 97 Rev 1 – 3; CST 1 – 3
Rev 1 – 3
1. What is an absorption spectrum? An emission spectrum? How are they related?
2. What is spectroscopy? How can spectroscopy be used to infer the composition and temperature of a star?
3. Describe the basic components of a simple spectroscope and the additional components in spectrographs used by astronomers for modern observations.
CST 1 – 3
1. Compared with a ground-based spectrum, the spectrum of a star observed from above Earth's atmosphere would show (a) no absorption lines; (b) fewer emission lines; (c) fewer absorption lines; (d) many more absorption lines.
2. The visible spectrum of sunlight reflected from Saturn's cold moon Titan would be expected to be (a) continuous; (b) an emission spectrum; (c) an absorption spectrum.
3. Figure 4.3 ("Elemental Emission"), shows the emission spectrum of neon gas. If the temperature of the gas were increased, we would observe (a) fewer red lines and more blue lines; (b) even more red lines; (c) some faint absorption bands; (d) no significant change.