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+// Estimation of smallest k-vector along x-direction
+// Basic Electronics
+// By Debashis De
+// First Edition, 2010
+// Dorling Kindersley Pvt. Ltd. India
+// Example 1-6 in page 21
+
+clear; clc; close;
+
+// Data given
+x=1; // x-coordiante
+y=1; // y-coordinate
+z=1; // z-coordinate
+E=0.3*1.6*10^-19; // Energy separation in eV
+m_c=0.067*0.91*10^-30; // Effective mass of conduction electron in kg
+h=1.05*10^-34; // Constant of calculation in Js
+
+// Calculation
+k_x=(2*m_c*E)/(3*h^2);
+A=sqrt(k_x);
+
+printf("K vector along (111) direction is %0.1e m^-1",A);
+
+// Result
+//Value of k-vector along (111) direction is 4.2*10^8 m^-1
+//Parabolic expression has been used to compute the k-vector
+\ No newline at end of file