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Explorations: Stars, Galaxies, and Planets
Thomas Arny, University of Massachusetts
Light and Atoms

Questions for Review



1

Why is light called electromagnetic radiation?
2

How are color and wavelength related?
3

What is a photon?
4

Name the regions of the electromagnetic spectrum from short to long wavelengths.
5

What is the difference between emission and absorption in terms of what happens to an electron in an atom?
6

What is the Doppler shift?
7

Which gases in the atmosphere absorb infrared radiation? Which gases absorb ultraviolet?
8

What is meant by the electromagnetic spectrum?
9

What are some of the things astronomers can learn about astronomical objects from their spectra?








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