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+//Example 7.3, Page Number 311

+//The Function fpround(dependency) is used to round a floating point number x to n decimal places

+//Minimum detectable signal

+clc;

+

+A=1000*(10**-6) //Cathode Area in metre square

+wf=1.25 //Work function in eV

+T=300 //Cathode temperature in Kelvin

+e=1.6*(10**-19) //Charge of an electron in Coulombs

+k=1.38*(10**-23) //Boltzman Constant in meter square kilogram per second square Kelvin

+a1=1.2*(10**6) //constant for pure metals in Ampere per metre square kelvin square

+l=0.5*(10**-6) //Wavelength in meters

+q=0.25 //Quantum Efficiency

+h=6.63*(10**-34) //Plancks Constant in meter square kilogram per second

+c=3*(10**8) //Speed of light in meters per second

+f=1//bandwidth in hertz

+

+//From equation 7.11

+e1=(k*T)/e 

+e1=fpround(e1,3)

+c2=(-1*wf)/e1

+c2=fpround(c2,4)

+c3=exp(c2)

+it=a1*A*(T**2)*c3 //it is the current generated in Amperes

+

+mprintf("The Thermionic Emission Current is:%.2e A\n",it)

+

+//Using Equation 7.9

+r=(q*e*l)/(h*c) //r is the responsivity in A/W

+r=fpround(r,2)

+mprintf(" The Responsivity is:%0.1f A/W\n",r)

+

+//Using Equation 7.13

+W=(sqrt(2*it*e*f))/r //W is the minimum detectable power in Watts

+mprintf(" The Minimum detectable signal power is:%.3e W",W)

+

+//The answer provided in the textbook is wrong