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diff --git a/1694/CH3/EX3.18/EX3_18.sce b/1694/CH3/EX3.18/EX3_18.sce
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+++ b/1694/CH3/EX3.18/EX3_18.sce
@@ -0,0 +1,13 @@
+clear;
+clc;
+printf("\nEx3.18\n");
+//page no.-134
+//given
+n=5;................//quantum no.
+a=2*10^-10;.........//width of box in m
+E1=14.7*10^-19;.....//energy in joules
+h=6.625*10^-34;.....//planck's constant in J-s
+
+m=(h^2)/(8*E1*a^2)......//mass of particle in kg
+
+printf("\nmass of particle is 9.33*10^-31 kg");