Q. According to the Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?
A) n = 6 to n = 5
B) n = 5 to n = 3
C) n = 6 to n = 1
D) n = 5 to n = 4
Explanation
[Solution from source] ΔE ∝ (1/n₁² − 1/n₂²): for 6 → 5 it is 1/25 − 1/36 = 0.0122, for 5 → 4 it is 1/16 − 1/25 = 0.0225, and the others are larger. So the 6 → 5 transition gives the least energetic photon. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.