The immediate source of the colored light produced by neon signs is the excitation of the neon atoms.
According to the Bohr theory, when energy is supplied to an atom, the electrons in the atom become excited and move from a lower to a higher energy level. The source of energy that causes excitation may be heat, electric discharge, etc.
As the excited atoms return to ground state, they emit energy in the form of visible light corresponding to a particular wavelength.
The source of the colored light produced by neon signs is the transition of neon atoms from higher to a lower energy level.
Learn more: https://brainly.com/question/3964366
