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diff --git a/1694/CH2/EX2.19/EX2_19.sce b/1694/CH2/EX2.19/EX2_19.sce
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+clear;
+clc;
+printf("\nEx2.19\n");
+//page no.-65
+//given
+del_x=10^-9;...............//uncertainty in position of electron in m
+h=6.6*10^-34;................//planck's constant in joule-sec
+m=9*10^-31;....................//mass of e in kg
+
+del_p=h/del_x...............//uncertainty in momentum in kg*m/sec
+//as p=m*v
+
+del_v=del_p/m................//uncertainty in velocity in m/s
+
+printf("\nuncertainty in velocity is 7.3*10^5 m/s\n");