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//Example 2_9_u2
clc();
clear;
//To calculate the fermi energy and fermi factor
ve=4*3 //No of Valence electrons
v=4.05*10^-10 //units in meter^3
n=ve/v^3 //units in meter^-3
h=4.14*10^-15 //units in eV sec
m=9.1*10^-31 //units in Kgs
Ef=(h^2*(3*n)^0.666)/(8*m*(%pi)^0.666) //units in J
Ef=Ef*1.67*10^-19 //units in eV
printf("Fermi energy is Ef=%.2f eV",Ef)
e_ef=0.1 //units in eV
kb=8.62*10^-5 //units in eV/K
t=300 //units in kelvin
fE=1/(1+exp((e_ef)/(kb*t)))
printf("\nFermi factor f(E) is %.4f",fE)
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