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diff --git a/2780/CH7/EX7.11/Ex7_11.sce b/2780/CH7/EX7.11/Ex7_11.sce
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+clc
+//to calculate uncertainity in position
+//actual formula is (delx)min*(delp)max=h/2*%pi-------------eq(1)
+//(delp)max=p(momentum of the electron)
+//mv=mov/sqrt(1-(v/c)^2)---------------------eq(2)
+mo=9*10^-31 //mass of an electron in m/s
+c=3*10^8 //light speed in m/s
+v=3*10^7 //velocity in m/s  
+h=6.6*10^-34 //plank's constant in J/s
+//from eq(1) and eq(2),we get
+delxmin=(h*sqrt(1-(v/c)^2))/(2*%pi*mo*v)
+disp("smallest possible uncertainity in the position of an electron is delxmin="+string(delxmin)+"m")