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Which of the following transitions in hydrogen atoms emit photons of highest frequency?

Asked in JEE Main 2007 · Spectral series and wavelengths

(1) n=1 to n=2
(2) n=2 to n=6
(3) n=6 to n=2
(4) n=2 to n=1

Answer: (4) n=2 to n=1

Step-by-step solution

Emission needs a fall.

2→1: 10.2 eV; 6→2: 3.0 eV.

Why the other options are wrong

(1) This is absorption, not emission.
(2) This is absorption.
(3) Smaller gap (3.0 eV).

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