1. Compare continuous, emission and absorption
spectra.
2. Examine the spectrum of a star in order to
identify its chemical composition.



Visible Light represents a small portion of the
electromagnetic spectrum.
Electromagnetic radiation can act as both a
wave and a particle. Light acting as a wave is
characterized by wavelength which is the
distance between wave crests. Light acting as a
particle consists of photons which are small
packets of energy.
Spectroscopy is the study of the properties of
light that depend on wavelength.
Periodic table of spectra
http://jersey.uoregon.edu/vlab/elements/Eleme
nts.html
Emission Spectra of elements with slider
http://chemlinks.beloit.edu/BlueLight/moviepa
ges/em_el.htm
Which spectrum is absorption, continuous and emission?
Group Activity:

Examine the spectrum of a star in order to
identify its chemical composition.
Objective:
3. Explain how astronomers can determine if a
star or galaxy is moving towards or away from
Earth.
/
Doppler Effect
Animation
http://www.wwnorton
.com/college/geo/eg
eo/flash/1_1.swf
Red Shift
Blue Shift
DOPPLER RED SHIFT
Red Shift Animation
http://www.wwnorton.com/college/geo/ege
o2/content/animations/1_2.htm