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diff --git a/1694/CH3/EX3.15/EX3_15.sce b/1694/CH3/EX3.15/EX3_15.sce
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+clear;
+clc;
+printf("\nEx3.15\n");
+//page no.-132
+//given
+v=10^-6;........//velocity in m/s
+m=10^-9;.......//mass in kg
+a=10^-4;.......//width in m
+h=6.62*10^-34;....//planck's constant in J-s
+
+E=(m*v^2)/2......//kinetic energy in joule
+
+n=sqrt((8*m*a^2*E)/h^2).........//quantum number
+
+printf("\nquantum number is 3*10^14\n");