How does an electron emit a photon?

The electron stays in an excited state for a short time. When the electron transits from an excited state to its lower energy state, it will give off the same amount of energy needed to raise to that level. This emitted energy is a photon. The energy of the photon will determine the color of the Hydrogen Spectra seen.

Explanation:

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >