At What Rate Are Photons Emitted by a 50

Short Answer

At what rate are photons emitted by a 50.0-W sodium vapor lamp if it is producing monochromatic light of wavelength $589 \mathrm {~nm} ? \left( c = 3.00 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } , h = 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s } \right)$