Explorations: An Introduction to Astronomy (Arny), 7th Edition

Chapter 4: Light and Atoms

Questions for Review

1
Why is light called electromagnetic radiation?
2
What is a photon? How fast can photons travel?
3
How are color and wavelength related? What about temperature and wavelength of a glowing body?
4
What is meant by the electromagnetic spectrum?
5
Name the regions of the electromagnetic spectrum from short to long wavelengths.
6
Describe the Kelvin temperature scale.
7
How does the color of dense materials change with temperature? How does this relate to the idea of a blackbody?
8
What makes elements different from each other? What is the arrangement of the parts of an atom?
9
What is the difference between emission and absorption in terms of what happens to an electron in an atom?
10
What are some of the things astronomers can learn about astronomical objects from their spectra?
11
Which gases in the atmosphere absorb infrared radiation? Which gases absorb ultraviolet?
12
Explain how the Doppler shift affects waves reflected by or emitted from a moving body.
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