The arrows below indicate transitions involving three energy levels of an atom. The wavelength of the photon emitted in each transition is indicated.

Which of the following relationships between the wavelengths is correct?

A. \({\lambda _1} = {\lambda _2} + {\lambda _3}\)

B. \({\lambda _1} = {\lambda _3} - {\lambda _2}\)

C. \(\frac{1}{{{\lambda _1}}} = \frac{1}{{{\lambda _2}}} + \frac{1}{{{\lambda _3}}}\)

D. \(\frac{1}{{{\lambda _1}}} = \frac{1}{{{\lambda _2}}} - \frac{1}{{{\lambda _3}}}\)

C