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+//Example 19.4 // Hall coefficient Hall voltage  

+clc;

+clear;

+//given data :

+p=4.83D21;//constant

+a=.428D-9;// unil cell side in m

+E=.15;// fermi level in eV

+k=1.38D-23;// Boltzmann constant

+h=6.626D-34;// plank constant in J-s

+T=300;// temperature in kelvin

+me=9.1D-31;// mass of electron in kg

+me1=.014*me;// effective mass in kg

+mh=.18*me;// effective mass of hole

+I=.1;// current in Amp

+B=.1;// magnetic field in tesla

+b=1D-3;// width of speciman in m

+n=2/a^3;// no. of atoms per unit volume

+d=k*T/1.6D-19;// to convert in eV

+e=1.6D-19;// charge of electron  

+R=1/(n*e);// Hall constant

+disp(R,"Hall coefficient for sodium in m3/C")

+// in second part InSb

+n1=2*((2*%pi*k*T/h^2)^1.5)*((me1*mh)^(3/4))*exp(-1*.15/(2*d));

+// formula for concentration in per m3

+R1=1/(n1*e);// Hall coefficient in m3/C

+V=R*I*B/b;//  Hall  voltage in V

+V1=R1*I*B/b// Hall voltage

+disp(V,"Hall voltage of sodium")

+disp(R1,"Hall coefficient for Insb in m3/C")

+disp(V1,"Hall Voltage of Insb")

+

+

+