How many photons are arriving per second? - Answers

The number of photons arriving per second depends on factors such as the intensity of the light source, the wavelength of the light, and the area over which the light is being measured. It can be calculated using the formula: ( N = \frac{I \cdot A}{E} ), where ( N ) is the number of photons, ( I ) is the intensity (power per unit area), ( A ) is the area of the surface, and ( E ) is the energy of a single photon, given by ( E = \frac{hc}{\lambda} ), with ( h ) being Planck's constant, ( c ) the speed of light, and ( \lambda ) the wavelength. Thus, the specific number of photons will vary based on these parameters.