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clc//
//
//
//Variable declaration
mew_e=0.19; //electron mobility(m^2/Vs)
e=1.6*10^-19;
T=300; //temperature(K)
k=1.38*10^-23;
//Calculation
Dn=mew_e*k*T/e; //diffusion coefficient(m^2 s-1)
//Result
printf("\n diffusion coefficient is %0.3f *10^-4 m^2 s-1",Dn*10^4)
printf("\n answer varies due to rounding off errors")
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