3/28/2004H133 Spring 20041Chapter Q1•Introduction to Quantum MechanicsEnd of 19thCentury only a few loose ends to wrap up.Led to Relativity which you learned about last quarterLed to Quantum Mechanics (1920’s-30’s and beyond)Behavior of atomic and subatomic worldNewton’s Laws don’t holdFoundation of most Physics Research that occurs these days.•Basic Ideas behind Quantum MechanicsSmall Particles behave like wavesNot localizedInterference effects (…more soon)Observations alter the system.oBasic quantities x, poIn QM if you try to determine xyou will effect pand visa versa.Implies bound systems have quantized states (Atomic Spectra)Waves (EM) behave like particles.•We need to understand Classical wave first.
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3/28/2004H133 Spring 20042Classical Waves•BasicsWaves are a disturbance that travel in a medium.e.g. water wavesNote: Particles in the medium are not traveling along with the wave.We will look at 1-D wave to begin.•Two types of wavesTension Wave (sometime called transverse)e.g. wave on a string.Compress ional Wave (sometimes call longitudinal)e.g. sound waveDemoEquilibrium PositionTube