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According to the Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?

1. n = 6 to n = 1
2. n = 5 to n = 4
3. n = 6 to n = 5
4. n = 5 to n = 3

Correct answer: n = 6 to n = 5

Solution

The energy of a photon is inversely proportional to the difference in energy levels. The transition from n = 6 to n = 5 involves the smallest energy difference, thus emitting the least energetic photon.

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