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//Variable declaration
rho=1.5*10**-8; //resistivity of metal(ohm m)
n=6.5*10**28; //number of free electrons(per m**3)
e=1.602*10**-19; //charge(c)
m=9.11*10**-31; //mass(kg)
//Calculation
tow=m/(n*e**2*rho); //relaxation time(s)
//Result
printf('relaxation time is %0.3f *10**-14 s \n',(tow*10**14))
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