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//To Calculate the Energy and linear Momentum and number of photons
//Example 42.1
clear;
clc;
h=4.14*10^-15;//Plank's Constant in eV-s
c=3*10^8;//Speed of Light in m/s
l=600*10^-9;//Wavelength of Light in metres
E=h*c/l;//Energy of each photon in eV
printf("(a) Energy of each photon = %.2f eV",E);
p=E/c;//Linear Momentum of each photon in eV-s/m
printf("\n Linear Momentum of each photon = %.2f*10^-8 eV-s/m",p*10^8);
A=1*10^-4;//Area of cross section in m^2
e=1.6*10^-19;//Charge on an electron
I=100;//Intensity of light in W/m^2
t=1;//Duration for which beam passes in seconds
E1=I*A*t;//Energy crossing 1 cm^2 in 1 second
n=E1/(E*e);//Number of photons crossing 1 cm^2 in 1 second
printf("\n (b) Number of photons crossing 1 cm^2 in 1 second = %.1f*10^16",n*10^-16);
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