1. 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

2. 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...

3. 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

4. September 15,
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 = _____

5. September 15, 1998 5 Balmer …analyzed Spectrum of Hydrogen
x meters
1 / l = R ( 1 / n / 12 )

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

7. September 15,
Bohr