class23 - Today: Matter waves! Announcements No HW for next...

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Today: Matter waves! Announcements No HW for next week! Use the time for reviewing all we have done until now. (Exam 2 is on Tuesday 7:30pm (Exam 2 is on Tuesday 7:30pm) Exam preparation: Review Chapters 1-5, & Lasers (11.9, 11.10). There will be several questions on Chapters • Why is angular momentum quantized yet Newton’s laws still work? • Why don’t electrons radiate when they are in fixed orbitals yet Coulomb’s law still Bohr model was a weird mix of classical physics and arbitrary rules… in fixed orbitals yet Coulomb’s law still works? • No way to know a priori which rules to keep and which to throw out… • BUT IT WORKS (for certain things)! • WHY is angular momentum quantized? • WHY don’t electrons radiate when they are in fixed orbitals? • How does electron know which level to jump to? Summary: What things CAN’T the Bohr model explain? (i.e. how to predict intensities of spectral lines) • Can’t be generalized to more complex (multi- electron) atoms • Shapes of molecular orbits and how bonds work • Can’t explain doublet spectral lines • Thomson – Plum Pudding – Why? Known that negative charges can be removed from atom. – Problem: just a random guess • Rutherford – Solar System – Why? Scattering showed a small, hard core. – Problem: electrons should spiral into nucleus in ~10 -11 sec. Bohr – fixed energy levels Models of the Atom + – Why? Explains spectral lines. – Problem: No reason for fixed energy levels • deBroglie – electron standing waves – Why? Explains fixed energy levels – Problem: still only works for Hydrogen.
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This note was uploaded on 08/24/2010 for the course PHYS 2130 taught by Professor Staff during the Spring '08 term at Colorado.

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class23 - Today: Matter waves! Announcements No HW for next...

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