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diff --git a/1694/CH3/EX3.20/EX3_20.sce b/1694/CH3/EX3.20/EX3_20.sce
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+clear;
+clc;
+printf("\nEx3.20\n");
+//page no.-135
+//given
+a=10^-10;........//width of box in m
+h=6.625*10^-34;....//planck's constant in J-s
+m=9.1*10^-31;......//mass of electron in kg
+n=2;..............//quantum no.
+e=1.6*10^-19;.....//charge
+
+p=n*h/2*a.........//momentum in Kg*m/s
+
+printf("\nmomentum is 6.625*10^-24 Kg*m/s\n");
+
+E=(n^2*h^2)/(8*m*a^2*e).....//energy in eV
+
+printf("\nenergy is 150.8 eV\n");