multiple - choice question\nwhat does an electron emit to get back to ground state?\nfire\nprotons\nphoton\nn…

Brief Explanations:

When an electron moves from an excited - state to the ground state, it releases energy in the form of a photon. Fire is a macroscopic phenomenon and not what an electron emits. Protons and neutrons are sub - atomic particles in the nucleus and not emitted by electrons to return to the ground state.

Answer:

C. photon