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Unformatted text preview: Chem 210 Chapter 6B / WANG Heisenberg’s Uncertainty Principle
• On the mass scale of atomic particles,
we cannot determine exactly the
position, direction of motion, and speed
• The product of the uncertainty in the
position (∆ x) and that of the momentum
(∆p) is greater or equal to h/4π. ∆x ⋅∆p ≥ h
4 h = Planck’s constant Please change
2 to 4, as given
in the textbook! Brief Explanation of correction
“Different versions of this equation are …
commonly found in the literature. Heisenberg's
original paper does not attempt to rigorously
determine the exact quantity on the right side of
the inequality, but rather uses physical argument to
show that the uncertainty between conjugate
quantum mechanical variables is approximately h.”
http://scienceworld.wolfram.com/physics/UncertaintyPrinciple.html ∆x ⋅∆p ≥ h
2π h = Planck’s constant Fall 2009 UM-SJTU JI Page 1 ...
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This note was uploaded on 07/30/2011 for the course CHEM 210 taught by Professor Zhang during the Spring '09 term at Shanghai Jiao Tong University.
- Spring '09