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+//Example 4_18
+clc;
+clear;
+close;
+format('v',6);
+//given data : 
+h=1.05*10^-34;//Js//Planks Constant
+e=1.6*10^-19;//C///Charge on electron
+E0=10^4;//V/cm
+a=5.62*10^-8;//cm//lattice constant for n-GaAs
+kB=2*%pi/a;//cm^-1///Brillouin Edge
+tau=h*kB/e/E0*10^12;//ps
+disp(tau,"Time taken by electron to reach Brillouin Zone(ps)");
+//Answer given in the textbook is wrong