Q 12-12-010JEE MainAIEEE 2012Easy
A hydrogen atom is excited to the state with principal quantum number $n = 4$. The maximum number of photons that this single atom can emit as it returns to the ground state is
Answer: (D) $3$
Concept. A single atom emits one photon per jump; the most photons come from stepping down one level at a time.
Step 1. Path. $4\to3\to2\to1$: three photons.
Answer. Option D.
Solution by Sreeraj P, M.Sc Physics
