# The electron in a hydrogen atom makes a transition n1 → n2 where n1 and n2 are the principal quantum numbers of two states. Assume the Bohr model to be valid. The time period of the electron in the initial state is eight times that is in the final stage. The possible values of n1 & n2 are  (A) n1 = 4, n2 = 2               (B) ​n1 = 8, n2 = 2               (C) ​n1 = 8, n2 = 1                  (D) ​n1 = 6, n2 = 3

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