Line spectra are due to

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(B) Line spectra are produced by atoms in the gaseous state. When electromagnetic radiation passes through a gas,the atoms absorb specific wavelengths

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Atoms in gaseous state

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(B) Line spectra are produced by atoms in the gaseous state. When electromagnetic radiation passes through a gas,the atoms absorb specific wavelengths corresponding to the energy transitions between their discrete electronic energy levels. This results in dark lines in the continuous spectrum (absorption spectrum) or bright lines when the excited atoms emit radiation (emission spectrum). Since atoms have well-defined,discrete energy levels,the resulting spectrum consists of distinct lines rather than a continuous band.

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