When the electrons of an excited atom return to a lower energy state, the energy emitted can result in the production of

(1) alpha particles (3) protons (2) isotopes (4) spectra

When the electron of an excited atom return to a lower energy state, the energy emitted can result in the production of spectra.

Explanation:

It leads to the emission of spectra. to grasp this: there are definite energy orbits in an atom. once you offer energy to a negatron in ground electron, it gets excited. Since, the excited energy level is unstable the negatron returns to the bottom state, emitting the energy it had taken earlier within the kind of radiation that forms spectra.

When the electron of an excited atom return to a lower energy state, the energy emitted can result in the production of spectra.