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+// Additional solved examples , Example 3 , pg 331
+T=260+273 //temperature(in kelvin)   (converting celsius into kelvin)
+h=6.625*10^-34//plancks constant(in Js)
+c=3*10^8//speed of light(in m/s)
+lam=590*10^-9//wavelength(in m)
+k=1.38*10^-23//boltzman constant (in (m^2*Kg)/(s^2*k))
+N=1/(exp((h*c)/(lam*k*T))-1)  //N=((n21)'/(n21))   ratio of stimulated  emission to spontaneous  emission
+printf("Ratio of stimulated  emission to spontaneous  emission is")
+disp(N)