Physics 7A
DLM 16 Overview
CG 4.1
The Intro Model of Thermodynamics
Act4.1.5
Followup of FNTs
(~45 min)
•
Deepen understanding of how the Thermodynamic Model provides an explanation for the observation that
C
p
is always significantly larger than C
v
for gases, but is only slight larger for most solids and liquids.
•
Practice using multiple models together to form a logical scientific argument.
CG 4.2
Working with the Thermodynamic Model: State Functions
Act4.2.2
Followup of CG 4.2 FNTs
(~45 min)
•
Practice working with state diagrams
•
Practice using multiple models together along with state diagrams to answer questions and get numerical
values
•
Practice determining work and heat (using information from other models as appropriate) from PV
diagrams
CG 4.3
Relation of Entropy to Microstates
Act4.3.1
States, Microstates, and Probabilities
(~30 min)
•
Introduction to the concepts of state and microstate of a system composed of a number of independent
“entities”
•
Introduction to the concept of the probability of being in a particular state being equal to the ratio of the
number of microstates associated with that state to the total number of microstates
Textbook Reading Assignment
Continue making sense of Chapter 4 and the three associated models.
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Physics 7A
Exit Handout
DLM 16
FNTs
4.31)
More practice with four coins
a)
Make a neat table that lists all the states and the corresponding microstates for the four coins in Activity
4.3.1 B.
The first two rows are shown below.
It is easier if you are systematic when listing the microstates.
You should have these from doing the activity.
STATE
MICROSTATES
0 H
T T T T
1 H
H T T T
T H T T
T T H T
T T T H
b)
Count the total number of microstates in your table.
What do you get?
c)
Convince yourself that you can get the number of different possibilities, which is the total number of
microstates,
by making the following argument as you think about flipping each coin in turn:
“When I flip
the first coin, there are two possibilities.
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 Fall '08
 PARDINI
 Physics, Thermodynamics, Entropy, Dice, Coin, heads, microstates

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