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Question
Q234) According to the Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon? [AIPMT (Mains)-2011]



SOLUTION

Because (E2– E1) > (E3 – E2) > (E4 – E3) > (E5– E4) > (E6– E5)
As the difference is of one energy levels
∴ (E6– E5) have less energy
{Alternatively value of Δ E [difference between two successive energy level decreases] as the distance from the nucleus increases.}
Answer:(a)