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Question: 

If an electron’s position can be measured to a precision of $2.4 \times 10^{-8} \textrm{ m}$, how precisely can its speed be known?

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: 

$4.8 \times 10^3 \textrm{ m/s}$

Giancoli 7th Edition, Chapter 28, Problem 4

(1:10)

Chapter 28, Problem 4 is solved.

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