Physics

Problem

5\,\text{mW}

laser emits light of wavelength

632.8\,\text{nm}

. Determine the number of photons emitted per second. (

h = 6.63 \times 10^{-34}\,\text{J s}

c = 3.0 \times 10^{8}\,\text{m s}^{-1}

)