September 15, 1998 Models of the Universe… “Laws of Nature”

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Presentation transcript:

September 15, 1998 Models of the Universe… “Laws of Nature” Earth Centered… Aristotle, Ptolemy Earth, Water, Air, Fire.. Falling Cycles in cycles Sun Centered… Coepernicus, Kepler’s Empirical Laws Ellipses, Areas, Periods Galileo’s Experimental Laws Inertia, Falling

September 15, 1998 2 Motions in Our Solar System Sun, Earth Moon Periods Sun around galaxy Stars around earth... Earth around sun, spin, seasons Phases of moon, planets Simulating Motion...

September 15, 1998 3 Models of the Atom Dalton - combinations of atoms Balmer - spectrum of hydrogen (l) Thomson - discovery of electron Planck - photon energy (E = h f) Rutherford -planetary model Bohr - physics of planetary model deBroglie - electron is wave Shrodinger - quantum model

September 15, 1998 4 Dalton … measured masses of atoms by weights of molecules made from combinations of atoms…. For example if .....….N2O = 4.0 ..……NO = 2.5 .……NO2 = 3.5 then …N = ____, O = _____

September 15, 1998 5 Balmer …analyzed Spectrum of Hydrogen 6.6 4.9 4.3 x 10-7 meters 1 / l = R ( 1 / n2 - 1 / 12 )

September 15, 1998 6 Thomson …. Discovered electron in 1895 e e e e

September 15, 1998 7 Bohr