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diff --git a/284/CH4/EX4.6/ex_6.sce b/284/CH4/EX4.6/ex_6.sce
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+// Chapter 4_Carrier Transport Phenomenon
+//Caption_The Einstein relation
+//Ex_6//page 155
+T=300
+mu=1000    //mobility of a particular carrier
+kT=0.0259
+e=1.6*(10^-19)
+D=(kT)*mu
+printf('Diffusion coefficient is %1.2fd cm^2/s ',D)
+\ No newline at end of file