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+//page no. 36
+//Example no 1-18
+clc;
+clear;
+
+disp('Solution (i) is ');
+x=620// difference in particle momentum In nm
+h=6.63*10^-34// planks constant In J/s
+//p=h/(4*%pi*x);
+//m*v=h/(4*%pi*x);
+m=9.11*10^-31 //In kg // mass of electron
+v=h /(4*%pi* x *10^-9*m);// electron velocity
+printf("\n The uncertanity in electron velocity is %0.0f m/s  \n",v);// result