Adapt the kinetic theory (that we used to derive the ideal gas law) to derive a formula for the pressure exerted by a gas of photons. n photons are in a box of volume v with perfectly reflecting walls. each photon has energy ey = hv , where h is planck's constant and v is a fixed frequency. recall that the magnitude of the momentum of a photon is given by p = h/1. express the pressure p in terms of n, v, and ey. how does this compare with the corresponding expression for an ideal gas?