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diff --git a/3718/CH1/EX1.18/Ex1_18.sce b/3718/CH1/EX1.18/Ex1_18.sce
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+//Chapter 1: Structure and Bonding
+//Problem: 18
+clc;
+
+//Declaration of Constants
+e = 1.602 * 10 ** -19           // Charge of proton, C
+m_p = 1.66 * 10 ** -27          // Mass of proton, kg
+m_e = 9.1 * 10 ** -31           // Mass of electron, kg
+h = 6.626 * 10 ** -34           // Plank's constant, J.sec
+
+// Variable
+V = 35                          // Acceleration potential, volt
+
+// Solution
+lamda_p = h / sqrt(2 * e * V * m_p)
+lamda_e = h / sqrt(2 * e * V * m_e)
+
+mprintf("The wavelength of electron when accelerated with same potential is %.3e m",lamda_e)