Which of the following transitions (in a hydrogen atom) represent absorption of the smallest frequency photon?

Which of the following transitions (in a hydrogen atom) represent absorption of the smallest frequency photon?



A) n = 5 to n = 6
B) n = 5 to n = 4
C) n = 4 to n = 1
D) n = 1 to n = 3
E) n = 1 to n = 2


Answer: A


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