The number of photons per second on an average emitted by the source of monochromatic light of wavelength 600 nm, when it delivers the power of 3.3 ×…

The number of photons per second on an average emitted by the source of monochromatic light of wavelength $\displaystyle 600$ nm , when it delivers the power of $\displaystyle 3.3 \times 10^{-3}$ watt will be : $\displaystyle \left(\mathrm{h}=6.6 \times 10^{-34} \mathrm{Js}\right)$