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diff --git a/1694/CH2/EX2.30/EX2_30.sce b/1694/CH2/EX2.30/EX2_30.sce
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+clear;
+clc;
+printf("\nEx2.30\n");
+//page no.-72
+//given
+del_x=1.1*10^-8;...............//uncertainty in position of electron in m
+h=1.05*10^-34;................//planck's constant in joule-sec
+m=9*10^-31;....................//mass of e in kg
+//By Heisenberg's uncertainty principle,
+
+del_v=h/(m*del_x)................//uncertainty in velocity in m/s
+
+printf("\nuncertainty in velocity is 1.06*10^4 m/s\n");