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clear
//
//
//
//Variable declaration
e=1.6*10**-19 //charge(c)
mew_n=0.3 //electron mobility(m**2/Vs)
rho=0.25 //resistivity(ohm m)
//Calculation
n=1/(rho*e*mew_n) //number of donor atoms per m**3
//Result
printf("\n number of donor atoms is %0.3f *10**19 per m**3",n/10**19)
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