Homework #1
— PHYS 603 — Spring 2007
Deadline:
Thursday, March 15, 2007, in class
Professor Victor Yakovenko
Office: 2115 Physics
Web page: http://www2.physics.umd.edu/˜yakovenk/teaching/
Textbook: Gregory H. Wannier,
Statistical Physics
Dover 1987 reprint of the 1966 edition, ISBN 048665401X
Do not forget to write your name and the homework number!
Each problem is worth 6 points.
Ch. 1 The First Law of Thermodynamics
1. Problem 1.5, Refrigiration by isothermal demagnetization.
Derive an analytical formula for the answer; do not plug the numbers (unless you wish
to compare with the answer in the textbook).
Use the First Law and the Curie Law in the form:
dU
=
dQ
+
H dM,
M
=
C
T
H,
(1)
where
C
is the Curie constant (not heat capacity!), and
U
(
T
) depends only on tem
perature
T
.
2. Problem 1.6, A formula for
C
p
/C
v
.
Derive this equation for an ideal gas with the equation of state (1.09)
PV
=
RT
. The
textbook sometimes call it a “perfect gas” or a “perfect fluid”.
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 Spring '08
 V.Yakovenco
 Thermodynamics, Work, Entropy, Professor Victor Yakovenko, analytical formula

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