The power output of a laser is measured by its wattage, the number of joules of energy it radiates per second. a 31.00 watt laser produces a beam of green light with a wavelength of 520.0 nm. calculate the energy of the photons and the number of photons emitted. you have calculated that the energy of each photon is 3.823 × 10⁻¹⁹ j. calculate the number of photons emitted by the laser per second.