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clear
//
//
//
//Variable declaration
rho=1.54*10**-8 //resistivity(ohm m)
n=5.8*10**28 //number of electrons
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("\n relaxation time is %0.3f *10**-15 s",tow*10**15)
printf("\n answer in the book varies due to rounding off errors")
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