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//Variable declaration
Kb=1.38*10**-23; //boltzmann constant
T=300; //temperature(K)
mewe=0.19; //mobility of electrons(m**2/Vs)
e=1.6*10**-19;
//Calculation
Dn=mewe*Kb*T/e; //diffusion coefficient(m**2/sec)
//Result
printf('diffusion coefficient is %0.3f *10**-3 m**2/sec \n',(Dn*10**3))
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