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According to Bohr atom model, in which of the following transitions will the frequency be maximum?

Asked in JEE Main 24th Feb 2nd Shift 2021 · Spectral series and wavelengths

(1) n=4 to n=3
(2) n=3 to n=2
(3) n=2 to n=1
(4) n=5 to n=4

Answer: (3) n=2 to n=1

Step-by-step solution

Gaps shrink as n grows.

2→1: 10.2 eV, far larger than 3→2 (1.89), 4→3 (0.66) and 5→4 (0.31).

Why the other options are wrong

(1) Picks a small gap high in the atom.
(2) Picks a smaller gap than 2→1.
(4) Thinks higher levels give larger gaps.

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