The two lines show that these are the only two lines that do not cause energy transition in the sodium atom. Option D
What are the two lines in the spectrum of sodium atom?
The spectrum of the sodium atom appears as a doublet. This implies that there are two lines in the spectrum and they appear as bright yellow lines that are not spaced apart in the spectrum.
The two bright yellow vertical lines in the spectrum shows that these are the only two lines that do not cause energy transition in the sodium atom.
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