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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Time period is equal to T=T0×n3  (where T0 is constant and n is the number of orbit)Let initial orbit is n1 and final time period is n2initial time period isT1=T0×n13 ..1final time period isT2=T0×n23 ..2according to questionT1=8T2T0×n13=8T0×n23n1=2n2so both a and satisfies this relationRegards

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