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+//Example 7.8, Page Number 334
+//Diffusion time of carrier
+clc;
+
+t=5*(10**-6) //Thickness of the layer in metres
+Dc=3.4*(10**-3) //Dc is the Minority diffusion coefficient in metre square per second
+
+//From equation 7.37
+td=(t**2)/(2*Dc) //td is the diffusion time in seconds
+
+mprintf("The Time taken for the excess carriers to diffuse is:%.1e s",td)