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clear;
clc;
printf("\nEx-6.9\n");
//page no.-188
//given
no=2.54*10^28;.....//no. of free e per unit volume of sodium
e=1.6*10^-19;......//charge in C
m=9.1*10^-31;....//mass of electron
h=6.625*10^-34;....//planck's constant in Js
E=(3*no/%pi)^(2/3)*(h^2)/(8*m*e)......//fermi energy in eV
//to convert in J multiply by charge e i.e. 1.6*10^-19
printf("\nfermi energy is 3.19 eV");
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