FermiDeriving Fermi Energy from the Total Energy of a Fermi Sphere

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SUMMARY

The discussion focuses on deriving the average energy \(E_m\) of a Fermi sphere, specifically showing that \(E_m = \frac{3}{5}E_f\). The key equations involved include \(E_m = \frac{1}{n} \int_0^{\infty} E p(E) dE\) and \(n = \int_0^{E_f} Q \sqrt{E} dE\), where \(p(E) = \frac{Q \sqrt{E}}{e^{(E - E_f)} + 1}\). The integration by parts method is suggested, but challenges arise in understanding the integral of \(p(E)\) from 0 to infinity.

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Homework Statement


use E_m=1/n (E)p(E)dE integral from 0 to Infinity
to derive E_m=3/5(E_f)


Homework Equations


n= p(E)dE integral from 0 to infinty
also n=Q*sqrt(E)dE integarl from 0 to (E_f)
p(E)=Q*sqrt(E)/(e^(E-E_f)+1)


The Attempt at a Solution


i tried doing integration by parts on it and moving stuff around but i can't seem to get it , is there a trick in using that the integral from o to infinty of p(E)dE = 0
 
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Please learn to use the latex command here. Otherwise most people won't understand what you are saying and won't help you. I can't even understand half of what you typed out.
 

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