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7) What Energy and Frequency must a photon have to raise an electron in a hydrogen atom from the n = 2 to the n

7) What Energy and Frequency must a photon have to raise an electron in a hydrogen atom from the n = 2 to the n = 4 state? (h = 6.626 x 10-34 J . s, 1 eV = 1.60 x 10-19 J)

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