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Energy levels A, B and C of a certain at...

Energy levels A, B and C of a certain atom correspond to increasing values of energy, i.e., `E_A lt E_B lt E_C`. If `lambda_1, lambda_2 and lambda_3` are the wavelengths of radiations for the transitions `C to B, B to A and C to A`, respectively, which of the following is correct?

A

`1//lambda_3 = 1//lambda_1 + 1//lambda_2`

B

`(lambda_3)^2 = (lambda_1)^2 + (lambda_2)^2`

C

`lambda_1 + lambda_2 + lambda_3 = 0`

D

`lambda_3 = lambda_1 + lambda_2`

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