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//Variable declaration
w=72.6; //atomic weight
d=5400; //density(kg/m**3)
Na=6.025*10**26; //avagadro number
mew_e=0.4; //mobility of electron(m**2/Vs)
mew_h=0.2; //mobility of holes(m**2/Vs)
e=1.6*10**-19;
m=9.108*10**-31; //mass(kg)
ni=2.1*10**19; //number of electron hole pairs
Eg=0.7; //band gap(eV)
k=1.38*10**-23; //boltzmann constant
h=6.625*10**-34; //plancks constant
T=300; //temperature(K)
//Calculation
sigmab=ni*e*(mew_e+mew_h); //intrinsic conductivity(ohm-1 m-1)
rhob=1/sigmab; //resistivity(ohm m)
n=Na*d/w; //number of germanium atoms per m**3
p=n/10**5; //boron density
sigma=p*e*mew_h;
rho=1/sigma;
//Result
printf('intrinsic conductivity is %0.3f *10**4 ohm-1 m-1 \n',(sigma/10**4))
printf('intrinsic resistivity is %0.3f *10**-4 ohm m \n',(rho*10**4))
printf('answer varies due to ing off errors')
printf('number of germanium atoms per m**3 is %0.3f *10**28 \n',(n/10**28))
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