An atom consists of three energy levels given by a ground state with energy `E_(0) = 0`, the first excited state with energy `E_(1) = K` and the second excited state with energy `E_(2) = 2K` where `K gt 0`. The atom is initially in the gound state. Light form a laser which emits photons with energy 1.5 K is shined on the atom. Which of the following is/are correct ?

Options

A. The Photons are abosorbed, putting one atom in a state `E_(1)` and one atom in a state `E_(2)`.
B. A photon will always we absorbed, but half the time the atom will go into the state with energy `K` and the other half into the state with energy `2K`. In this way, energy will be conserved on the average.
C. The atom absorbs a photon, goes into the first excited state with energy `K` and emits a photon with energy `0.5 K` to conserve energy.
D. The atom does not absorb any photon and stays in the ground state.

Answer

D