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clear
//
//
//
//Variable declaration
c=3*10**8 //velocity of light(m/sec)
lamda=632.8*10**-9 //wavelength(m)
h=6.626*10**-34 //planck's constant(Jsec)
t=1 //time(sec)
P=2.3*10**-3 //power(W)
sa=1*10**-6 //spot area(m**2)
//Calculation
new=c/lamda //frequency(Hz)
n=P*t/(h*new) //number of photons emitted(per sec)
Pd=P/sa //power density(kW/m**2)
//Result
printf("\n number of photons emitted is %0.2f *10**15 photons/second",n/10**15)
printf("\n power density is %0.3f kW/m**2",Pd/10**3)
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