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// Chapter 4 Example 10
//==============================================================================
clc;
clear;
// input data
l = 0.1*10^-9; // side of cubical box
h = 6.625*10^-34 // plancks constant in Jsec
m = 9.11*10^-31 // mass of electron in Kg
Kb = 1.38*10^-23 // Boltzmann constant
// Calculations
// for cubical box the energy eigen value is Enx ny nz = (h^2/(8*m*l^2))*(nx^2 + ny^2 +nz^2)
// For the next energy level to the lowest energy level nx = 1 , ny = 1 and nz = 2
nx = 1
ny = 1
nz = 2
E112 = (h^2/(8*m*l^2))*( nx^2 + ny^2 + nz^2);
// we know the average energy of molecules of aperfect gas = (3/2)*(Kb*T)
T = (2*E112)/(3*Kb); // Temperature in kelvin
// Output
mprintf('E112 = %3.4e Joules\n Temperature of the molecules T = %3.4e K',E112,T);
//==============================================================================
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