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+//Optoelectronics - An Introduction, 2nd Edition by J. Wilson and J.F.B. Hawkes
+//Example 7.3
+//OS=Windows XP sp3
+//Scilab version 5.5.2
+clc;
+clear;
+
+//given
+A=1000e-6;//Cathode area in m^2
+Phi=1.25;//Work function of the metal in eV
+kT_by_e=0.025;//constant term =product of Boltzmann constant with Ambient temperature divided by charge of an electron in SI Units
+a=1.2e6;//Constant value for pure metals in A m^-2 K^-2
+T=300;//Temperature in K 
+e=1.6e-19;//Electronic charge in C
+Lambda=0.5e-6;//wavelength in m
+eta=0.25;//Dimensionless Quantum efficiency
+h=6.6e-34;//Planck's constant in SI Units
+c=3e8;//Speed of light in air in m/s
+Deltaf=1;//Bandwidth in Hz
+
+iT=a*A*(T^2)*exp(-Phi/kT_by_e);//Thermionic emission current in A
+mprintf("\n iT = %.1e A",iT);//The answer provided in the textbook varies due to roundingoff 
+
+Rlambda=eta*e*Lambda/(h*c);//Responsivity of the photomultiplier in A W^-1
+mprintf("\n Rlambda = %.1f A/W",Rlambda);
+
+Wmin=sqrt(2*iT*e*Deltaf)/Rlambda;//Minimum detectable signal power in presence of dark current iT in W
+mprintf("\n Wmin = %.1e W",Wmin);//The answer provided in the textbook varies due to roundingoff