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// chapter 4 , Example 4.2 , pg 117
E1=10^4 //energy emitted per second(in J)
n=900*10^3 //frequency(in Hz)
h=6.625*10^-34 //plancks constant(in J s)
E=h*n//energy carried by 1 photon(in J)
N=E1/E//number of photons emitted per second
printf("number of photons emitted per second\n")
disp(N)
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