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//Example 2.3, Page no 50
p=1//j/s
r=1//radius in m
h=6.63*10^-34//Joule-sec
c=3*10^8//m/sec
lambda=5.89*10^-7//m
R=p/(4*%pi*r^2)
E=(h*c)/lambda
Rate_R=R*(1/E)
printf("\nRate at which photons strike unit area of place %e photons/m^2-sec",Rate_R)
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