A hydrogen atom is in the ground state it absorbs energy, Ask an Expert

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A hydrogen atom is in the ground state. It absorbs energy and makes a transition to the n = 4 excited state. The atom returns to the ground state by emitting two photons, one in dropping to n = 3 state, and one in further dropping to the ground state. What are the photon wavelengths of

(a) the first and

(b) the second transitions?

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