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//Example 4.3, Page number 4.32
clc;clear;close
// variable declaration
C=3*10**8 // Velocity of light m/s
W=632.8*10**-9 // wavelength in m
P=2.3
t=1
h=6.626*10**-34 // Planck constant
S=1*10**-6
// Calculations
V=C/W // Frequency
n=((P*10**-3)*t)/(h*V) // no.of photons emitted
PD=P*10**-3/S // Power density
// Result
printf("Frequency = %0.2e Hz",V)
printf("\nno.of photons emitted = %0.2e photons/sec",n)
printf("\nPower density = %0.1f kWm^-2",(PD/1000))
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