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+// Time taken to reach Brillouin zone
+// Basic Electronics
+// By Debashis De
+// First Edition, 2010
+// Dorling Kindersley Pvt. Ltd. India
+// Example 1-11 in page 46
+
+clear; clc; close;
+
+// Data given
+h=1.05*10^-34; // Constant of calculation in Js
+Kb=1.112*10^8; // Wave vector at Brillouin xone along x-axis /cm
+E_0=10^4; // External electric field applied in V/cm
+e=1.6*10^-19; // Charge on an electron in C
+
+// Calculation
+tou=(h*Kb)/(e*E_0);
+
+printf("Time taken by electron is %0.3e s",tou);
+
+// Result
+// Time taken by electron to reach Brillouin zone is 7.297 ps
+\ No newline at end of file
diff --git a/181/CH1/EX1.11/example1_11.txt b/181/CH1/EX1.11/example1_11.txt
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+ Time taken by electron is 7.298e-012 s 
+\ No newline at end of file