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Wave Optics

Question
CBSEENPH12038586

Which of the following given transitions in a hydrogen atom emits the photon of lowest frequency?
(i) n = 2 to n = 1
(ii) n = 4 to n = 3.

Solution
(ii) n = 4 to n = 3 

As n increases, the energy levels gradually gets more closer. And, as a result hydrogen atom emits photon of lowest frequency in the transition.