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//Variable declaration
mewn=0.35; //mobility of electrons(m**2/Vs)
e=1.602*10**-19;
rho=0.2; //resistivity(ohm m)
//Calculation
n=1/(rho*e*mewn); //density of donor atoms
//Result
printf('density of donor atoms is %0.3f *10**19 electrons/m**3 \n',(n/10**19))
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