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NEET Chemistry QUESTION #7358
Question 1
According to Bohr's theory, which transition in the hydrogen atom produces a photon with the least energy?
  • \(n=5\) to \(n=3\)
  • \(n=6\) to \(n=1\)
  • \(n=5\) to \(n=4\)
  • \(n=6\) to \(n=5\)✔️
Correct Answer Explanation
Key principle: Energy of emitted photon \(\propto \Delta E = E_{n_1} - E_{n_2}\)

The closer the two energy levels, the smaller the energy gap. For large \(n\) values, the levels are very close together. The transition \(n=6 \to n=5\) involves adjacent high-\(n\) levels, so it releases the least energy (longest wavelength photon).

This transition falls in the infrared (Humphreys series).