// Additional solved examples , Example 12 , pg 336
E1=2*10^4 //energy emitted per second(in J)
n=1000*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)