AS 101
04/10/2012
BRAHE AND KEPLER
LAW OF ELLIPSES
Keplers Law #1 (1609)
Orbits of planets are ellipses with the sun at one focus.
A closed curve with two special points inside called foci.
Special
AS 101
LECTURE #1
CHAPTER 1
Atoms 4%
Dark Matter 23%
Dark Energy 72%
Note: Dark= not invisible.
Sun
Generates energy through nuclear fusion
300,000 times the mass of earth
Planets
Non luminous and sph
AS 101
09/10/2012
THE UNIVERSAL THEORY OF GRAVITY
Newton realized that all objects in the universe with mass attract all other objects with
mass
o Mass: the amount of matter in an object (in kg)
o We
AS 101
11/10/2012
Light is a wavicle
How light behaves depends on how you treat it, it is both wave-like and particle-like
WHAT ARE WAVES?
Waves are any repeating motion that can carry energy witho
AS 101
18/10/2012
WHICH PHOTOS EXCITE ELECTRONS?
Photons of the wrong wavelength are transmitted
If the wavelength corresponds to the exact amount of energy needed for a transition, the electron
absor
AS 101
MIDTERM INFORMATION
18/10/2012
Do not need to memorize:
o Dates
o Exact umbers
o Equations
You do need to know:
o Relative sizes and distances (brightest furthest)
o How numbers are used to des
AS 101
MIDTERM INFORMATION
18/10/2012
Do not need to memorize:
o Dates
o Exact umbers
o Equations
You do need to know:
o Relative sizes and distances (brightest furthest)
o How numbers are used to des