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(A) At room temperature,hydrogen atoms are in the ground state,where the electron is in the $n = 1$ energy level.When radiation is passed through the

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Lyman series

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(A) At room temperature,hydrogen atoms are in the ground state,where the electron is in the $n = 1$ energy level.When radiation is passed through the gas,the atoms can only absorb photons that provide enough energy to excite the electron from $n = 1$ to higher energy levels $(n = 2, 3, 4, \dots)$.Transitions starting from $n = 1$ to any higher energy level $(n > 1)$ correspond to the Lyman series in the absorption spectrum.Since there are no electrons in the $n = 2$ level or higher at room temperature,no absorption lines corresponding to the Balmer series (which requires transitions starting from $n = 2$) will be observed.Therefore,only the Lyman series is observed.

If radiation of all wavelengths from ultraviolet to infrared is passed through hydrogen gas at room temperature,absorption lines will be observed in the:

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