Energy levels \( A, B \) and \( C \) of a certain atom correspond to increasing values of energy...

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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 \( \lambda_{1}, \lambda_{2} \) and \( \lambda_{3} \) are the wavelengths of radiations corresponding to transitions \( C \) to \( B, B \) to \( A \) and \( C \) to \( A \) respectively, which of the following relations is correct?
(a) \( \lambda_{3}=\lambda_{1}+\lambda_{2} \)
(b) \( \lambda_{3}=\frac{\lambda_{1} \lambda_{2}}{\lambda_{1}+\lambda_{2}} \)
(c) \( \lambda_{1}+\lambda_{2}+\lambda_{3}=0 \)
(d) \( \lambda_{3}^{2}+\lambda_{1}^{2}+\lambda_{2}^{2} \)
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