Light from a sodium lamp is passed through co | vedclass

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(C) According to Kirchhoff's law of radiation,a substance in its unexcited (ground) state absorbs the same wavelengths that it emits when it is in an

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Sodium doublet lines

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(C) According to Kirchhoff's law of radiation,a substance in its unexcited (ground) state absorbs the same wavelengths that it emits when it is in an excited state.Since the sodium lamp emits the characteristic sodium doublet lines ($5890 \ \mathring{A}$ and $5896 \ \mathring{A}$),the cold sodium vapours will absorb these specific wavelengths from the incident light.Consequently,these two lines will be missing from the transmitted spectrum,resulting in the appearance of dark lines at these positions in the continuous spectrum of the sodium lamp.However,the question asks what the spectrum of the transmitted light consists of. Since the absorbed lines are removed,the transmitted light will show the absence of these lines (absorption lines).Given the options provided,the most accurate physical description is that the transmitted light lacks the sodium doublet lines,which is often described in textbook contexts as the absorption of these lines.

Light from a sodium lamp is passed through cold sodium vapours. The spectrum of the transmitted light consists of:

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