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+//Example 7_1_u2
+clc();
+clear;
+//To calculate the mean free path
+mn=0.26*0.91*10^-30
+un=1000*10^-4
+e=1.6*10^-19
+tc=(mn*un)/e
+vth=10^7
+meanfreepath=vth*tc*10^7 //units in nm
+printf("The mean free path is given by L=%.1f nm",meanfreepath)