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+//Chapter 1: Structure and Bonding
+//Problem: 4
+clc;
+
+//Declaration of Constants
+c = 3 * 10 ** 8                 // Speed of light,in m/sec
+m = 9.1 * 10 ** -31             // Mass of electron,in kg
+h = 6.626 * 10 ** -34           // Plank's constant,in J.sec
+
+//Declaration of Variable
+ke = 4.55 * 10 ** -25           // Kinetic Energy,in J
+
+// Solution
+v = sqrt(ke * 2 / m)
+
+lamda = h / (m * v)
+
+mprintf("The de Broglie wavelength is : %.2e m',lamda)