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// chapter 6 , Example6.12 , pg 177
n=5.8*10^28 // electron concentration (in /m^3)
e=1.6*10^-19 // charge of electron (in C)
rho=1.54*10^-8 //resistivity of metal (in ohm*m)
M=9.11*10^-31 //mass of electron (in Kg)
T=M/(n*e^2*rho) //relaxation time
printf("Relaxation time(in s)")
disp(T)
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