When an electron in an atom of hydrogen moves from the second to the first principal energy level...?

Question

the result is the emission of...
1) a beta particle 3) quantized energy
2) alpha particle 4) gamma particles

Please justify your answer, and thanks in advance.

Answer 1

3) quantized energy
Reason?
1) a beta particle is the electron--but this electron does not leave the nuclear.
2) alpha particle is He nuclear with atomic mass 4.
4) gamma particles --particles? the energy of gamma ray is very high--the transition from the second to the first principal energy level is only in the ultraviolet.

Answer 2

The answer is quantized energy. For example, emission of a photon of wavelength 121.6 nm could occur (Lyman alpha line). This photon corresponds to "quantized energy." The spontaneous transition from a 2p orbital to the ground state (1s orbital) is a one-photon process, whereas the transition from a 2s orbital to a 1s orbital is a two-photon process. It's a poorly-worded question, though, since "gamma particles" are also "quantized energy" (they are high-energy photons).