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//Variable declaration
rho=1.54*10**-8; //resistivity of metal(ohm m)
n=5.8*10**28; //number of free electrons(per m**3)
e=1.602*10**-19; //charge(c)
m=9.11*10**-31; //mass(kg)
E=1*10**2; //electric field(V/m)
Kb=1.381*10**-23; //boltzmann constant
T=300; //temperature(K)
//Calculation
tow=m/(n*e**2*rho); //relaxation time(s)
vd=e*E*tow/m; //drift velocity(m/s)
mew=vd/E; //mobility(m**2/Vs)
Vth=sqrt(3*Kb*T/m); //thermal velocity(m/s)
//Result
printf('relaxation time is %0.3f *10**-14 s \n',(tow*10**14))
printf('drift velocity is %0.3f m/s \n',(vd))
printf('mobility is %0.3f *10**-2 m**2/Vs \n',(mew*10**2))
printf('thermal velocity is %0.3f *10**5 m/s \n',(Vth/10**5))
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