A certain electronic transition from an excited state to the ground state of the $H_{2}$ atom in one or more steps gives rise to four lines in the ultraviolet region of the spectrum, how many lines does this transition produce in the infrared region of the spectrum?

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Solution

The correct option is D $3$
Four lines are observed in the ultraviolet region of the spectrum.

These corresponds to the transitions $5 \to 1, 4 \to 1, 3 \to 1$ and $2 \to 1$ .

The possible transitions in the IR region are $5 \to 4, 5 \to 3$ and $4 \to 3$ .

Thus, in the infrared region of the spectrum, 3 lines are produced.

Hence, the correct option is $C$

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A certain electronic transition from an excited state to the ground state of the H2 atom in one or more steps gives rise to four lines in the ultraviolet region of the spectrum, how many lines does this transition produce in the infrared region of the spectrum?

A certain electronic transition from an excited state to the ground state of the $H_{2}$ atom in one or more steps gives rise to four lines in the ultraviolet region of the spectrum, how many lines does this transition produce in the infrared region of the spectrum?