Universe
Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 16, Problem 35Q
To determine

To explain: The reason behind the often use of Hα filter by the astronomers to view the chromosphere. Also, explain the way in which this can also be performed using filters which are transparent only to wavelengths emitted by H and K lines of ionized calcium.

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