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| -rw-r--r-- | 3655/CH3/EX3.5/Ex3_5.sce | 34 |
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diff --git a/3655/CH3/EX3.5/Ex3_5.png b/3655/CH3/EX3.5/Ex3_5.png Binary files differnew file mode 100644 index 000000000..3d96dccc5 --- /dev/null +++ b/3655/CH3/EX3.5/Ex3_5.png diff --git a/3655/CH3/EX3.5/Ex3_5.sce b/3655/CH3/EX3.5/Ex3_5.sce new file mode 100644 index 000000000..d8ef2e1e9 --- /dev/null +++ b/3655/CH3/EX3.5/Ex3_5.sce @@ -0,0 +1,34 @@ +// Example 3.5 +// Computation for percentage increase in zero-external-field thermoinic-emission current because of the schottky effect// +// Page no.78 + +clc; +clear; +close; + +//Given data ; +V=500;//plate voltage +ra=1;//anode radius +rk=0.01;//cathode radius +r=10^-4; +T=2500; + + + +//Calculation for electric field intensity at the surface of the cathode// +E=(V/(log(ra/rk)))*(1/r); + +//Calculation for percentage increase in zero-external-field thermoinic-emission current because of the schottky effect// +P1=log(%e^((0.434*0.44*E^(1/2))/T));//P1=log(I/Ith) +P2=10^0.0796;//P2=I/Ith + +//I/Ith=1.20,shows that the schottky theory predicts a 20 percent increase over the zero-field emission current// + + +//Displaying the result in command window +printf('\n Electric field intensity at the surface of the cathode = %0.3f x 10^6 V/m',E*10^-6); +printf('\n \n log(I/Ith) = %0.4f ',P1); +printf('\n \n I/Ith = %0.2f ',P2); +printf("\n \n \n \n I/Ith=1.20,shows that the Schottky theory predicts a 20 percent increase over the zero-field emission current."); + +//Answers are varying due to round off error// |
