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clear
//
//
//

//Variable declaration
rho=1.50*10**-8    //resistivity(ohm m)
n=6.5*10**28       //conduction 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(sec)

//Result