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Question: 

How much energy is needed to ionize a hydrogen atom in the n = 3 state?

Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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Quick Answer: 

$1.51 \textrm{ eV}$

Giancoli 7th Edition, Chapter 27, Problem 50

(0:38)