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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))