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clear
//
//
//
//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("\n intrinsic conductivity is %0.3f *10**4 ohm-1 m-1",sigma/10**4)
printf("\n intrinsic resistivity is %0.3f *10**-4 ohm m",rho*10**4)
printf("\n answer varies due to rounding off errors")
printf("\n number of germanium atoms per m**3 is %0.1f *10**28",n/10**28)
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