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+//Example 8.4
+//Program to determine:
+//(a)Drift time of the carriers
+//(b)Junction capacitance of the photodiode
+
+clear;
+clc ;
+close ;
+
+//Given data
+w=20*10^(-6);           //metre - WIDTH OF INTRINSIC REGION
+r=500*10^(-6);          //metre - RADIUS
+epsilon_s=10.5*10^(-11);//F/m - PERMITTIVITY
+vd=10^5;                //m/s - DRIFT VELOCITY OF ELECTRONS
+
+//(a)Drift time of the carriers
+t_drift=w/vd;
+
+//(b)Junction capacitance of the photodiode
+A=%pi*r^2;
+Cj=epsilon_s*A/w;
+
+//Displaying the Results in Command Window
+printf("\n\n\t (a)Drift time of the carriers is %1.0f ps.",t_drift/10^(-12));
+printf("\n\n\t (b)Junction capacitance of the photodiode is %1.0f pF.",Cj/10^(-12));
+\ No newline at end of file