initial commit / add all books

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+//Exa3.2

+clc;

+clear;

+close;

+// given data

+E=5.5;// in eV; (Fermi energy)

+E=E*1.6*10^-19;// in J 

+miu_e=7.04*10^-3; //in m^2/V-s  (Mobility of electrons)

+n=5.8*10^28 ; // in /m^3   (Number of conduction electrons/m^3)

+e=1.6*10^-19; // in coulomb

+m=9.1*10^-31;//in kg

+//(i) Relaxation time,

+tau=miu_e/e*m;

+disp("(i) Relaxation time is : "+string(tau)+" second");

+sigma=(n*e*miu_e);

+//(ii) Resistivity of conductor,

+rho=1/sigma;

+disp("(ii) Resistivity of conductor is : "+string(rho)+" ohm-meter");

+// (iii) Let Velocity of electrons with fermi energy = v

+v=sqrt(2*E/m);

+disp("(iii) Velocity of electron with Fermi-level is : "+string(v)+" m/s");

+