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+//chapter 31
+//example4
+clc
+//given
+m=9.1*10^-31 //in kg
+n=8.4*10^28 //in m-1
+e=1.6*10^-19 //in coul
+p=1.7*10^-8 //in ohm-m
+v=1.6*10^8 //in cm/sec
+T=2*m/(n*p*e^2)
+disp(T,"(a) Mean time b/w collisions in sec is")
+Lambda=T*v
+disp(Lambda,"(b) Mean free path in cm is")