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A sample of hydrogen is in a specific excited state A. By absorption of photons of energy 2.55 eV

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A sample of hydrogen is in a specific excited state A. By absorption of photons of energy 2.55 eV it reaches to another excited state B. Calculate principal quantum number for A and B. [nA = 2, nB = 4]

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It is clear that here excited energy level are n = 2 and n = 4

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