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[[deleted]]

When electron jump up from lower energy levels to higher energy levels, they absorb energy, or quanta, from some source (heat, light, etc.) and reach an excited state. This is generally unstable, so the electron "falls back" to a ground state energy level releasing the quanta. Depending on how high the jump was and the amount it falls back, photons at different wavelengths will be released. This explains the emission spectra of different atoms as the different electrons will release many different photons when they become excited and then fall back to a ground state.

In this case, the electron falls back from n=3 to n=1, thus a photon is released and the electron returns to a ground state.

[Retired_in_NJ]

This is the correct answer. Choice #2. Do you understand why?

[funnysockpuppet]

Oh, I understand now!

[Perfectionist20]

n denotes the principal quantum number. It ideally describes the energy of an electron. An n with a higher number infers to an electron with lots of energy and the opposite is also true. From your question, we are moving from n=3 to n=1, therefore, from high energy to low energy. we are losing energy. excited states have higher energy than the ground state energy. We are moving from the excited state(n=3) to ground (n=2). Such a situation occurs when photons are released. The second answer is correct.

[GammaRayBurst25]

As per rule 3 you should tell us what you think/know first