Atomic Structure: Practice Problem & Solution

Solution Explained:

To solve this problem, we apply the core principles of Atomic Structure. Understanding the underlying formula is key to arriving at the correct answer below:

Ultraviolet radiation corresponds to Lyman series (transition to $n=1$). Infrared radiation corresponds to Paschen (to $n=3$), Brackett (to $n=4$), etc. Among the options, $4 \rightarrow 3$ belongs to the Paschen series, which emits infrared radiation.