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+// Energies of electrons in conduction band
+// Basic Electronics
+// By Debashis De
+// First Edition, 2010
+// Dorling Kindersley Pvt. Ltd. India
+// Example 1-4 in page 21
+
+clear; clc; close;
+
+// Data given
+k=0.01*10^10; // k-vector value /m
+h=1.05*10^-34; // Constant of calculation Js
+m_0=0.91*10^-30; // Mass of conduction electron Kg
+m_c1=0.067*m_0; // Effective mass of GaAs conduction electron Kg
+m_c2=0.01*m_0; // Effective mass if InAs conduction electron Kg
+
+// Calculation
+E_1=(h^2*(9*k^2))/(2*m_c1);
+A_1=(E_1)/(1.6*10^-19);
+
+printf("(a)Energy of conduction electron in GaAs = %0.2e eV\n",A_1);
+
+E_2=(h^2*(9*k^2))/(2*m_c2);
+A_2=(E_2)/(1.6*10^-19);
+
+printf("(b)Energy of conduction electron in InAs = %0.3e eV",A_2);
+
+// Results
+// (a) Energy of conduction electron in GaAs is 50.9 meV
+// (b) Energy of conduction electron in InAs is 340.7 meV
+
diff --git a/181/CH1/EX1.4/example1_4.txt b/181/CH1/EX1.4/example1_4.txt
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+(a)Energy of conduction electron in GaAs = 5.09e-002 eV
+(b)Energy of conduction electron in InAs = 3.407e-001 eV 
+\ No newline at end of file