1 files changed, 8 insertions, 6 deletions
diff --git a/3411/CH15/EX7.1.u2/Ex7_1_u2.sce b/3411/CH15/EX7.1.u2/Ex7_1_u2.sce
index a17e3227c..016f1977b 100644
--- a/3411/CH15/EX7.1.u2/Ex7_1_u2.sce
+++ b/3411/CH15/EX7.1.u2/Ex7_1_u2.sce
@@ -1,11 +1,13 @@
 //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
+//To calculate the mean free path and mean free time
+mn=0.26*0.91*10^-30           //units in Kgs
+un=1000*10^-4        //units in cm^2 V^-1 s^-1
+e=1.6*10^-19          //units in coulombs
+tc=(mn*un)/e         //units in s
+tc1=tc*10^12         //units in ps
+printf("The mean free time is %.3fps",tc1)
 vth=10^7
 meanfreepath=vth*tc*10^7       //units in nm
-printf("The mean free path is given by L=%.1f nm",meanfreepath)
+printf("\nThe mean free path is given by L=%.1f nm",meanfreepath)