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+// Exa 5.3
+clc;
+clear;
+close;
+format('v',5)
+// Given data
+W = 10^-6;// in m
+I_E =2;// in mA
+I_E = I_E * 10^-3;// in A
+V_T = 26;// in mV
+V_T = V_T * 10^-3;// in V
+D_B = 47*10^-4;
+//g_m = abs(I_C)/V_T = abs(I_E)/V_T;
+// The emitter diffusion capacitance, Cbe = g_m*((W^2)/(2*D_B));
+Cbe = I_E/V_T*W^2/(2*D_B);// F
+Cbe= Cbe*10^12;// in pF
+disp(Cbe,"The emitter diffusion capacitance in pF is");
+Cbe= Cbe*10^-12;// in F
+g_m = abs(I_E)/V_T;
+// The transition frequency 
+f_T = g_m/(2*%pi*Cbe);// in Hz
+f_T = f_T * 10^-6;// in MHz
+disp(f_T,"The transition frequency in MHz is");
+
+// Note: The answer in the book is not accurate.