In an energy level transition from the n = 2 state to the n =1 state for a hydrogen atom a photon will be emitted.

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When an electron in a hydrogen atom transitions from the n=2 state to the n=1 state, it releases energy in the form of a photon. This is because the energy level difference between the two states corresponds to the energy of a photon in the visible region of the electromagnetic spectrum.

In an Energy Level Transition from the N = 2