
#1
Aug2309, 03:53 AM

P: 25

1. The problem statement, all variables and given/known data
Plot the heat capacity as a function of temperature for aluminium, using the Einstein model. 2. Relevant equations The Einstein model for heat capacity: 3. The attempt at a solution The model assumes that the frequencies of all the harmonic oscillators in the material are the same. But does it mean "same for all temperatures" or "same for a given temperature"? And if the latter is true, will I need to find a function [tex]\epsilon (T)[/tex]? Because otherwise the right hand side of the Cv equation wil have two free variables. Thankful for help, my textbook is very unclear about this. 



#2
Aug2309, 06:30 AM

HW Helper
PF Gold
P: 3,444

In this model, the frequency of each oscillator is the same at all temperatures, but the energy varies with temperature. Define
[tex]\frac{1}{x}=\frac{\epsilon}{kT}[/tex] Plot C(1/x) / 3Nk vs. x which is a dimensionless plot, good for any choice of specific values. Here, it's the shape that counts. 


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