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CH01 Notes

# CH01 Notes - Phys 4141 Introduction to Quantum Mechanics...

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1 Phys 4141 Introduction to Quantum Mechanics Syllabus instructor: Prof. Jonathan P. Dowling (his) office hour: T&Th 12:00-1:00PM Textbook: Griffths (2 nd ed), Feagin (1 st Ed) Already Homework 1 Any question -> to Jon at next week

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2 What is Quantum? cf) classical Small size (microscopic scale) How small? Usually comparable size of the Atom Cf) size of H-atom: Bohr s radius ( ) ( ) Why not classical mechanics? Experimental data require another type of mechanics. => Quantum Mechanics
3 1.1 Schr ö dinger Equation A system which consists of a particle with mass in potential ( ) (for simplicity 1-D) Classical Mechanics: position ( ) Newton s 2 nd law: : velocity : acceleration : force : Kinetic energy Quantum Mechanics : wave function ( ) Schrodinger equation: : complex number ( ) ( : Planck s constant)

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4 1.2 Statistical Interpretation Born s statistical interpretation | ( )| = probability of finding the particle between and , at time [ | ( )| ( ) ( ) with complex conjugate ( ) ] Probability gives indeterminacy. Question: When we measure the particle
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CH01 Notes - Phys 4141 Introduction to Quantum Mechanics...

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