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Hydrogen gas can only absorb EM radiation that has an energy corresponding to a transition in...

Hydrogen gas can only absorb EM radiation that has an energy corresponding to a transition in the atom, just as it can only emit these discrete energies. When a spectrum is taken of the solar corona, in which a broad range of EM wavelengths are passed through very hot hydrogen gas, the absorption spectrum shows all the features of the emission spectrum. But when such EM radiation passes through room-temperature hydrogen gas, only the Lyman series is absorbed. Explain the difference.

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Here , in the room temperature Hydrogen , there is only one stable state in the Hydrogen as room temperature which is the first state , n =1 , now , for n = 1 , only Lyman series is absorbed .

Now, when When a spectrum is taken of the solar corona, in which a broad range of EM wavelengths are passed through very hot hydrogen gas, the absorption spectrum shows all the features of the emission spectrum becuase there is all the stable and metasble states present in the Hydrogen atom

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