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10.40 Thermodynamics
Problem Set 8
Fall 2003
1. Compute U/(RT) of a mole of diatomic ideal gas molecules treating the
vibrational mode classically. Assume that the vibrational frequency is
1013 s-1, and take the reference state as E = 0 when the system is in its
ground state (degeneracy of 1 and no important excited electronic states).
In a few words, explain the significance of the difference between the
quantum and classical results.
2. Show that the standard deviation or square root of the variance of the
distribution of particle densities, σρ, for a pure fluid varies as (<N>)-1/2 for a
fixed volume system. For typical thermodynamic systems, what happens to
the value of σρ / <ρ> at low densities and at the critical point?
3. Problem 10.11 in the text
4. Problem 10.12 in the text
Be sure to state and justify all assumptions made.
Modified: 12/21/2004