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diff --git a/728/CH8/EX8.4/Ex8_4.txt b/728/CH8/EX8.4/Ex8_4.txt
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+//Caption:Calculate (i)-electron velocity,(ii)-dc transit time, (iii)-input voltage for maximum output voltage,(iv)-voltage gain in dB
+//Exa:8.4
+clc;
+clear;
+close;
+V_o=900;//in volts
+I_o=30*10^-3;//in A
+f=8*10^9;//in Hz
+d=0.001;//in m
+l=0.04;//in m
+R_sh=40*10^3;//in ohm
+v_o=0.593*10^6*sqrt(V_o);
+T_o=l/v_o;
+Theeta_o=(2*%pi*f)*T_o;//Transit angles between cavities(in radian)
+Theeta_g=(2*%pi*f)*d/v_o;//Average gap transit angle (in radian)
+b=sin(Theeta_g/2)/(Theeta_g/2);
+V_in_max=V_o*3.68/(b*Theeta_o);
+//As, {J(X)/X=0.582}
+A_r=b^2*Theeta_o*0.582*R_sh/(30*10^3*1.841);
+disp(v_o,'Electron velocity (in m/s) =');
+disp(T_o,'Dc Transit Time (in sec)=');
+disp(V_in_max,'Maximum input voltage (in volts) =');
+disp(A_r,'Voltage gain (in dB) =');
+\ No newline at end of file