Atoms on the State stimulus it is not stable, so it must return to the ground state, so its stability. When the atoms back to the ground state, loosening some energy out, emitting light.
Atomic excitation is not stable, so it must return to the ground state to its stability. When the atoms return to the ground state to release some energy out of the light emission.
The atom on the excited state is not stable, so it must be returned to the ground state to ตัวมัน stability. When the atom ground state energy will relax back to something called the emitting light.