Question

The energy levels of the hydrogen spectrum is shown in the figure. There are some transitions $A,B,C,D\text{and}E$. Transition $A,B\text{and}C$ respectively represents

• A. First spectral line of Lyman series, third spectral line of Balmer series and second spectral line of Paschen series.
• B. Series limit of Brackett series, second spectral line of Balmer series and third spectral line of Paschen series.
• C. Series limit of Lyman series, third spectral line of Balmer series and second spectral line of Paschen series.
• D. Series limit of Lyman series, second spectral line of Balmer series and third spectral line of Paschen series.

Answer 1

The correct option is C Series limit of Lyman series, third spectral line of Balmer series and second spectral line of Paschen series.

Lyman series corresponds to the transition from higher energy level $(n=2,3,4,\mathrm{5...}\infty )$ to $n=1$.

Similarly,
Balmer series corresponds to the transition from higher energy level $(n=3,4,\mathrm{5...}\infty )$ to $n=2$.

Paschen series corresponds to the transition from higher energy level $(n=4,\mathrm{5...}\infty )$ to $n=3$.

Transition $A$ $(n=\infty$ to $n=1)$ represents series limit of Lyman series.

Transition $B$ $(n=5$ to $n=2)$ represents the third spectral line of Balmer series.

Transition $C$ $(n=5$ to $n=3)$ represents the second spectral line of Paschen series.

Hence, option $\left(C\right)$ is correct.