The figure indicates the energy level diagram of an atom and the… | NEET 1995 (AIPMT)

Q60NEET 1995 · AIPMTMedium

Energy of the Electron & Energy Levels

The figure indicates the energy level diagram of an atom and the origin of six spectral lines in emission (e.g. line no. 5 arises from the transition from level $B$ to $A$ ). Which of the following spectral lines will occur in the absorption spectrum?

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Answer: (c)

In absorption, atoms start in the ground state $X$ (almost all atoms are there).
Only lines that end on $X$ in emission appear in absorption: lines 1 ( $C \leftrightarrow X$ ), 2 ( $B \leftrightarrow X$ ), 3 ( $A \leftrightarrow X$ ).
Lines 4, 5, 6 start from excited levels, which are nearly empty.
So the answer is (c) 1, 2, 3.

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Energy of the Electron & Energy Levels question from NEET 1995 (AIPMT)

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