You expose a gas of argon atoms to light with photon energies that don't correspond to the energy difference between any pair of states in the argon atom. Explain what happens to the light. Nothing happens because a gas of argon can never emit photons of light. The light is absorbed because the atoms of the argon gas have radiative transitions to higher energy states that can absorb photons of that light. The light is absorbed because the atoms of the argon gas have radiative transitions to lower energy states that can absorb photons of that light. Nothing happens because the atoms of the argon gas have no radiative transitions that can absorb photons of that light.