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+// Calculate semiconductor band gap
+// Basic Electronics
+// By Debashis De
+// First Edition, 2010
+// Dorling Kindersley Pvt. Ltd. India
+// Example 1-2 in page 7
+
+clear; clc; close;
+
+// Data given
+lambda=0.5*10^-6; // Wavelength of emitted light in m
+c=3*10^8; // Speed of light in vacuum in m/s
+h=1.05*10^-34;// Constant of calculation
+
+// Calculation
+E_g= (2*%pi*h*c)/lambda;
+A= E_g*10^19/1.6;
+
+printf("The material band gap has to be %0.3f eV",A);
+
+// Result
+//The material band gap is 2.474 eV
+// Semiconductors like C,BN,GaN,SiC meet this criterion
+\ No newline at end of file
diff --git a/181/CH1/EX1.2/example1_2.txt b/181/CH1/EX1.2/example1_2.txt
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+The material band gap has to be 2.474 eV 
+\ No newline at end of file