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 \times 10^{-3} `` watt will be : `` \left( h =6.6 \times 10^{-34} Js \right) ``
(A) `` 10^{18} ``
(B) `` 10^{17} ``
(C) `` 10^{16} ``
(D) `` 10^{15} ``