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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)) \ No newline at end of file