An Introduction to Thermal Physics
An Introduction to Thermal Physics
1st Edition
ISBN: 9780201380279
Author: Daniel V. Schroeder
Publisher: Addison Wesley
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Chapter 7.1, Problem 4P
To determine

To derive the Saha equation from the ratio of probability of an unoccupied state to two occupied states.

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The Hamiltonian for a free classical ideal gas of N atoms can be written as H=p}+p%+…+px, where we have chosen units such that 2m = 1. (a) Show that the phase-space volunie is r(E, V) = K, VNEa(vĒ), where Ko is aconstant, and n= 3N. (b) Calcuļate Eg, and obtain the entropy S(E, V). Verify that it agrees with the result from thermodynanics.
A) An atom has two electronic levels of energy 0 and. Suppose the atom is in thermal equilibrium with a heat bath at temperature T. What ensemble should be used for this atom? Calculate the partition function Z, the average energy E, and the Helmholtz free energy F for this atom in the canonical encapsulation. Find the probabilities of each microstate of the atom. B) Calculate the entropy S of this atom for the various methods given below. i) F = E-TS ii) Using the appropriate derivative of F. iii) Calculate (S -kn E: -P. In p.)using the microstate distribution probabilities.
In the canonical ensemble, we control the variables T, p, and N, and the fundamental function is the Gibbs free energy (G). But if we control T, p, and μ, then we will have a different fundamental function, Z (This is the case for cells that often regulate their temperature, pressure, and chemical potentials to maintain equilibrium). Which of the below options should the Z function equal? H - TS - μN H + TS + μN H + TS - μN G + μN F - pV - μN -H + TS + μN
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