All problems are from the text,
(7th edition) by
Freedman & Kaufmann.
* Also use Fig. 19-12 to find the temperature and spectral types of stars with equal line strenghts of (i) iron (Fe I) and calcium (Ca I) and (ii) neutral and singly ionized helium (He I and He II).
** Extra credit.
Be sure to show your work. A simple "Yes" does not constitute a complete answer. You must write in complete sentences and show all mathematical computations to receive full credit. Your homework must be legible for us to grade it - please be neat!