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// Scilab Code Ex6.3: Page-192 (2006)
clc; clear;
N_A = 6.023e+023; // Avogadro's number
// For Si
A = 28.1; // Atomic weight of Si, g/mol
a = 5.43e-08; // Lattice constant for Si, cm
n = 8/a^3; // Number of atoms per unit volume, atoms/cc
rho = n*A/N_A; // Density of Si, g/cc
printf("\nThe density of Si = %4.2f atoms per cc", rho);
// For GaAs
A = 69.7+74.9; // Atomic weight of GaAs, g/mol
a = 5.65e-08; // Lattice constant for Si, cm
n = 4/a^3; // Number of atoms per unit volume, atoms/cc
rho = n*A/N_A; // Density of GaAs, g/cc
printf("\nThe density of GaAs = %5.3f atoms per cc", rho);
// Result
// The density of Si = 2.33 atoms per cc
// The density of GaAs = 5.324 atoms per cc
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