Which rays cannot be produced by electronic transitions?

Explanation

Alpha particles are a type of nuclear radiation and consist of two protons and two neutrons, originating from the nucleus, not from electronic transitions. Therefore, they cannot be produced by electronic transitions, which involve changes in the energy levels of electrons in an atom. Infrared radiation is electromagnetic and results from electronic transitions. Although gamma rays are also electromagnetic, they are generally associated with nuclear processes rather than electronic transitions. Thus, the correct answer is that alpha rays cannot be produced by electronic transitions.