What is fluorescence? A.) It is the emission of light by electrons in atoms that have absorbed an ultraviolet photon and stayed for some considerable time at higher energy levels before dropping down. B.) It is the emission of ultraviolet light by passing an electric current through mercury vapor, for example in a fluorescent light bulb.. C.) It is the light emitted by electrons in atoms after they have absorbed several infrared photons and stayed in the excited state after the infrared light was turned off. D.) It is the emission of light by electrons that have absorbed several infrared photons to reach a higher energy level, before falling down to a lower level. E.) It is the emission of light by electrons in atoms after they have absorbed an ultraviolet photon and then dropped down through several energy levels, emitting light in one or more of the steps.
In a standard fluorescence process, an incident ultraviolet photon is absorbed and transfers its energy to an electron, the electron loses some of its energy and then the electron makes a transition to the ground (lower) state emitting a photon with energy in the visible region.
Also, When a molecule reaches an excited state, it does not stay there for very long. Rather it quickly returns to a lower energy state and emits lights.
Therefore, from the given options
option (E ) seems most feasible
What is fluorescence? A.) It is the emission of light by electrons in atoms that have...