Course Icon

Chapter 5: 5-8 Homework

Course Materials are always under revision! Weblecture content may change anytime prior to two weeks before scheduled chat session for content.

SO Icon


Scholars Online Astronomy - Chapter 5: 5-8: Stellar Spectra


Reading Preparation

Reading: Astronomy, Chapter 5: Sections 5-8 Stellar Spectra, Composition, and the Doppler shift

Study Notes: notes on your assigned reading from the text

Key Formulae to Know

  • Planck's law E   =   hc λ   =   h ν

    h = 6.625 * 10-34 Joule-seconds = 4.135 * 10-15 eV-seconds

  • Bohr's law 1 λ   =   R   ( 1 n i 2   1 n o 2 )  

    R = 1.097 * 107 m-1

  • Dopper shift λ   λ 0   λ 0   =   Δ λ λ 0   =   v c

Web Lecture

Read the following weblecture before chat: Light and how it tells us what's out there (Part 2)

Study Activity

  • Planetarium Program: Use your planetarium program to examine the Virgo cluster. (If your program does not include information in detail, you may look up the cluster in Wikipedia or another source.). The Virgo Cluster is a group of more than 2000 galaxies extending across 9 million light-years, located about 50 million LY from Earth. Use your program to examine galaxies in the cluster more closely. Are all of the galaxies the same color? Do all galaxies contain stars of the same surface temperature? Locate several spiral galaxies. One of the dominant colors of the inner and outer regions of these galaxies? What can you conclude about the surface temperatures of the brightest stars in the inner regions compared to the service temperatures of those in the outer spiral?
  • Optional Websites: Astronomy Answers (On Light) has a number of questions (and answers) commonly asked about light by astronomy students.

Chat Preparation Activities

Chapter Quiz

Lab Work

Read through the lab for this week; bring questions to chat on any aspect of the lab, whether you intend not perform it or not. If you decide to perform the lab, be sure to submit your report by the posted due date.