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Lect_36_note - Chapter 40-42 Introduction to Quantum...

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Chapter 40-42 Introduction to Quantum Physics
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Classic physics z A particle is described by its position and velocity, a wave is described by its wavelength and frequency. z Newton’s laws and Maxwell’s equations describe their behavior. P =mu u λ f
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Quantum Mechanics z The theory of quantum mechanics was developed in the 1920s z Enables use to understand various phenomena involving a toms, molecules, nuclei and solids
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Werner Heisenberg z Nobel Prize in 1932 z Developed matrix mechanics of quantum physics z Many contributions include: z Uncertainty principle z Prediction of two forms of molecular hydrogen z Theoretical models of the nucleus 1901 – 1976 German physicist
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The Uncertainty Principle z Quantum theory predicts that it is fundamentally impossible to make simultaneous measurements of a particle’s position and momentum with infinite accuracy P, v x x = 1.00000…………………. ...0 ± x m v = 1.00000…………………. ...0 ± v m/s
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Heisenberg Uncertainty Principle P, v x 2 x xp ∆≥ h Video – uncertainty
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Heisenberg Uncertainty Principle Explained P, v x 2 x xp ∆≥ h
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Heisenberg Uncertainty Principle, Explained z It is physically impossible to measure simultaneously the exact position and exact momentum of a particle z The inescapable uncertainties do not arise from imperfections in practical measuring instruments z The uncertainties arise from the quantum structure of matter
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Quantum Particle z The quantum particle is a new model that is a result of the recognition of the dual nature z Entities have both particle and wave characteristics hh λ p mu ==
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Quantum Particle z If you use an instrument which is capable of
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This note was uploaded on 01/28/2011 for the course PHYS 011 taught by Professor Nianlin during the Fall '08 term at HKUST.

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Lect_36_note - Chapter 40-42 Introduction to Quantum...

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