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Question: 

An electron remains in an excited state of an atom for typically $10^{-8} \textrm{ s}$. What is the minimum uncertainty in the energy of the state (in eV)?

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: 

$ 7 \times 10^{-8} \textrm{ eV}$

Giancoli 7th Edition, Chapter 28, Problem 5

(0:55)

Chapter 28, Problem 5 is solved.

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