lecture24 - Bohr vs. Correct Model of Atom Physics 102:...

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Unformatted text preview: Bohr vs. Correct Model of Atom Physics 102: Lecture 24 Pick up diffraction grating when you enter! Early Model for Atom But how can you look inside an atom 10-10 m across? Light (visible) = 10-7 m Electron (1 eV) = 10-9 m Helium atom = 10-11 m---- + + + + Plum Pudding positive and negative charges uniformly distributed throughout the atom like plums in pudding 38 Rutherford Scattering Scattering He ++ atoms off of gold. Mostly go through, some scattered back! Atom is mostly empty space with a small (r = 10-15 m) positively charged nucleus surrounded by cloud of electrons (r = 10-10 m) (Alpha particles = He + + ) 42 Plum pudding theory: + and charges uniformly distributed electric field felt by alpha never gets too large To scatter at large angles, need positive charge concentrated in small region (the nucleus)---- + + + + + Nuclear Atom (Rutherford) Classic nuclear atom is not stable! Electrons will radiate and spiral into nucleus Need quantum theory Large angle scatterings nuclear atom 45 Recap Photons carry momentum p=h/ Everything has wavelength =h/p Uncertainty Principle p x > h/(2 29 Atom Positive nucleus 10-15 m Electrons orbit 10-10 m Classical E+M doesnt give stable orbit Need Quantum Mechanics! 50 Bohr Model is Science fiction The Bohr model is complete nonsense. Electrons do not circle the nucleus in little planet- like orbits....
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lecture24 - Bohr vs. Correct Model of Atom Physics 102:...

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