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+clear;
+clc;
+printf("\nEx-6.2\n");
+//page no.-184
+//given
+no=5.8*10^28;......//free electrons per m^3
+e=1.6*10^-19;......//charge in C
+h= 1.05*10^-34;.....//planck's constant in Js
+
+m=9.1*10^-31;.......//mass of electron in kg
+
+E=(3*no*%pi^2)^(2/3)*(h^2)/(2*m*e)......//fermi energy of electron
+
+printf("\nfermi energy of electron is 5.4 eV\n");
+
+v=((2*E)/m)^(1/2);......//speed of electron in m/s
+
+printf("\nspeed of electron is 1.4*10^6 m/s");