Question

The transition from the state n = 4 to n = 3 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from

(a) 2 → 1 

(b) 3 → 2

(c) 4 → 2 

(d) 5 → 4

Answer 1

Correct Option (d) 5 → 4

Explanation:

IR corresponds to least value of (1/n₁² - 1/n₂²)

i.e., from Paschen, Brackett and Pfund series. Thus, the transition corresponds to 5 → 4