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// Scilab Code Ex6.11: Page-200 (2006)
clc; clear;
k = 1.38e-023; // Boltzmann constant, J/mol/K
e = 1.6e-019; // Energy equivalent of 1 eV, J/eV
rho_40 = 0.2; // Resistivity of Ge at 40 degree celsius, ohm-m
T1 = 40+273; // Temperature at which resistivity of Ge becomes 0.2 ohm-m, K
T2 = 20+273; // Temperature at which resistivity of Ge is to be calculated, K
E_g = 0.7; // Band gap of Ge, eV
// As rho = exp(E_g/(2*k*T)), so for rho_20
rho_20 = rho_40*exp(E_g/(2*k/e)*(1/T2-1/T1)); // Resistivity of Ge at 20 degree celsius, ohm-m
printf("\nThe resistivity of Ge at 20 degree celsius = %3.1f ohm-m", rho_20);
// Result
// The resistivity of Ge at 20 degree celsius = 0.5 ohm-m
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