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Question: 

If an electron’s position can be measured to a precision of 15 nm, what is the uncertainty in its speed? Assuming the minimum speed must be at least equal to its uncertainty, what is the electron’s minimum kinetic energy?

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: 

$7.7 \times 10^3 \textrm{ m/s, } 2.7 \times 10^{-23} \textrm{ J}$

Giancoli 7th Edition, Chapter 28, Problem 11

(1:47)

Chapter 28, Problem 11 is solved.

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