A hydrogen atom initially in the n = 3 level emits a photon and ends up in

Question:

A hydrogen atom initially in the n = 3 level emits a photon and ends up in the ground state.
(a) Compute the energy of the emitted photon?
(b) If this atom then absorbs a second photon and returns to the n = 3 state, what must the energy of this photon be?

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