Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 30 - Quantum Physics - Problems and Conceptual Exercises - Page 1076: 70

Answer

$3.40\times 10^{-34}m$; $56.5\times 10^{-6}m$

Work Step by Step

We know that the uncertainty in the baseball position is given as $\Delta y \ge \frac{h}{2\pi(m_{baseball})(\Delta v_y)}$ We plug in the known values to obtain: $\Delta y\ge \frac{6.63\times 10^{-34}J.s}{2(3.14)(0.15Kg)(0.05)(41m/s)}$ $\implies \Delta y\ge 3.40\times 10^{-34}m$ Now the uncertainty in electron position is given as $\Delta y\ge \frac{h}{2\pi m_e \Delta v_y}$ We plug in the known values to obtain: $\Delta y\ge \frac{6.63\times 10^{-34}J.s}{2(3.14)(9.11\times 10^{-31}Kg)(0.05)(41m/s)}$ $\implies \Delta y \ge 56.5\times 10^{-6}m$
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