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The ratio of the wavelengths for 2  1 transition in Li++He+ and H is 
(a) 1 : 2 : 3            (b) 1 : 4 : 9
(c) 4 : 9 : 36           (d) 3 : 2 : 1

(c) 1λ=RZ21n12-1n22λ1Z2

λLi++:λHe+:λH=4:9:36

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