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clear
//
//
//

//Variable declaration
rho=0.2    //resistivity(ohm m)
e=1.602*10**-19     //charge(c)
mewn=0.35     //mobility of charge carriers(m**2/Vs)

//Calculation
n=1/(rho*mewn*e)     //density of donor atoms(electrons/m**3)

//Result