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diff --git a/1694/CH2/EX2.31/EX2_31.sce b/1694/CH2/EX2.31/EX2_31.sce
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+++ b/1694/CH2/EX2.31/EX2_31.sce
@@ -0,0 +1,15 @@
+clear;
+clc;
+printf("\nEx2.31\n");
+//page no.-72
+//given
+h=6.62*10^-34;................//planck's constant in joule-sec
+m=9*10^-31;....................//mass of e in kg
+v=3*10^7;......................//velocity in m/sec
+c=3*10^8;......................//speed of light in m/s
+
+//By Heisenberg's uncertainty principle,
+
+del_x=(h*sqrt(1-(v^2/c^2)))/(2*%pi*m*v).........//uncertainty in position in m
+
+printf("\nuncertainty in position of electron is 0.0388 angstrom\n");