Before class preparation

• Read and think about the questions here (to be discussed in class)

In class activity

• Pear Deck: Star Spectra
• Observing spectral lines w/gas tubes
• Spectrum lines demonstration of 3 “Mystery Stars”

After class work

• Video: Emission & Absorption Spectra
• Use this website to help you identify the element in the 3 “Mystery stars” today.
  • (Helium, Hydrogen, Xenon)