A laser emits light at a wavelength of 463 nm during a pulse lasting 25 ms, with a total energy of 1.2 J. The energy of an individual photon can be calculated using the formula E = hc/λ, where h is Planck's constant and c is the speed of light. The duration of the pulse is considered irrelevant for calculating the number of photons emitted, which can be determined by dividing the total energy by the energy per photon. Participants in the discussion also clarified the correct speed of light and emphasized the importance of unit consistency in calculations. The conversation highlights the complexities involved in understanding photon emission in the context of laser physics.