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//To Calculate the Factor Increase in the Value of Thermionic Current
//Example 41.1
clear;
clc;
T1=1500;//Initial Temperature in Kelvin
T2=2000;//Final Temperature in Kelvin
k=1.38*10^-23;//Boltzmann Constant
phi=4.5*1.6*10^-19;//Work Function in electron-volts
Ir=(T2/T1)^2*exp((-phi/k)*((1/T2)-(1/T1)));//Factor Increase in the Value of Thermionic Current
printf("Thermionic current increases %.d times when temperature is increased from 1500 K to 2000 K",Ir);
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