We’re being asked to determine **transition corresponding to the emission of 177 and absorption 124 nm photon.**

Recall that the * energy of a photon (E)* is given by:

$\overline{){\mathbf{E}}{\mathbf{=}}{\mathbf{hv}}}\left(1\right)$

where:

**h** = Planck’s constant (6.626 × 10^{–34} J • s)

**v** = frequency (in s^{–1})

Also, recall that the frequency (v) and wavelength (λ) are related:

$\overline{){\mathbf{\lambda}}{\mathbf{=}}\frac{\mathbf{c}}{\mathbf{v}}}\left(2\right)$

where:

**c** = speed of light (3.0 × 10^{8} m/s)

For this question consider the figure that shows an energy level diagram for a certain atom (not hydrogen). Several transitions are shown and are labeled by letters. Note: The diagram is not drawn to scale.

Which transition corresponds to the emission of a 177 nm photon?

Which transition corresponds to the absorption of a 124 nm photon?

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