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+// Example 7.12, page no-168
+clear
+clc
+
+rho=1.54*10^-8
+e=1.6*10^-19 //C
+ef=5.5*e//J
+n=5.8*10^28///per cubic meter
+m=9.1*10^-31//kg
+
+//(i)
+t=m/(rho*n*e^2)
+mu=e*t/m
+printf("\n(i)\nThe relaxation time is %.2f*10^-14 s\nThe mobility of the electrons is %.4f *10^-3 m^2/V-s",t*10^14,mu*10^3)
+
+//(ii)
+vd=e*t*100/m
+printf("\n\n(ii)\nthe drift velocity of elctron is %.5f m/s",vd)
+
+//(iii)
+vf=sqrt(2*ef/m)
+printf("\n\n(iii)\nFermi velocity is %.2f*10^6 m/s",vf*10^-6)
+
+//(iv)
+lam=vf*t
+printf("\n\n(iv)\nThe mean free path is %.3f*10^-8 m",lam*10^8)