Lecture 3.3 Light and Matter
Matter Basics
The
number is written as a left superscript and is basically equal to the number of
protons and neutrons.
The
number is written as a left subscript and is equal to the number of protons. It is
redundant with the symbol because the symbol also tells how many protons there are (by definition).
are atoms that have the same number of protons but different number of neutrons.
are atoms with a different number of electrons than protons.
are a set of atoms which are tightly bound together.
As a notation CI means
Carbon. CII means singly ionized Carbon. CIII means doubly
ionized Carbon. This notation is most common in astronomical circles. It is not a notation used by all fields
(like Chemistry).
Atoms are mostly
space.
Four Fundamental Forces
1.
is the force that all masses exert on each other. Written as an
equation it is
2.
is the force that charges exert on each other. Written as an equation
is is:
3.
is the force that keeps the nucleus together. It is very short ranged.
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 Spring '08
 dacis
 Astronomy, Atom, Photon

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