Energy levels A, B and C of a certain atom correspond to increasing values of energy i.e. E A < E B < E C . If 1 , 2 and 3 are wave lengths of radiations corresponding to transitions C to B, B to A and C to A respectively, which of the following relations is correct -

1. A. 3 = 1 + 2
2. B. 1 + 2 + 3 = 0
3. C. 3 2 = 1 2 + 2 2
4. D. 3 = 1 2 1 + 2

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