Which transition in the hydrogen spectrum would have the same wavelength as the Balmer type transition from n = 4 to n = 2 of He+ spectrum (A) n = 1 to n = 3 (B) n = 1 to n = 2 (C) n = 2 to n = 1 (D)

Question

Which transition in the hydrogen spectrum would have the same wavelength as the Balmer type transition from n = 4 to n = 2 of He+ spectrum

(A) n = 1 to n = 3
(B) n = 1 to n = 2
(C) n = 2 to n = 1
(D) n = 3 to n = 4

Prashant Kotian · Accepted Answer

Correct answer: C. H  =  He RH × (1)2        2 1 n n = RH × (2)2        2 ) ( ) (        2 1 n n =              4 4 1 n 1 – 2 n 1 = 1 – 1 n1 = 1 ; n2 = 2 for H-atom

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