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Question: Answered & Verified by Expert
According to the Bohr theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?
ChemistryStructure of AtomJEE Main
Options:
  • A $n=6$ to $n=1$
  • B $n=5$ to $n=4$
  • C $n=6$ to $n=5$
  • D $n=5$ to $n=3$
Solution:
2026 Upvotes Verified Answer
The correct answer is: $n=6$ to $n=5$
$\because \Delta E \propto\left[\frac{1}{n_1^2}-\frac{1}{n_2^2}\right]$, where $n_2>n_1$ Energy of photon obtained from the transition $n=6$ to $n=5$ will have least energy.

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