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//Variable declaration
mewn=0.3; //mobility of electrons(m**2/Vs)
rho=0.25; //resistivity(ohm m)
e=1.6*10**-19;
//Calculation
n=1/(rho*e*mewn); //number of donor atoms(per m**3)
//Result
printf('number of donor atoms is %0.3f *10**19 per m**3 \n',(n/10**19))
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