1 answer

Which of the following transitions would result in the absorption of a photon with the longest wavelength?

Question:

enter image source here


Answers

The absorption with longest wavelength is #n = 7 → n = 8#.

Explanation:

The relation between energy #E# and wavelength #λ# is

#color(blue)(bar(ul(|color(white)(a/a)E =(hc)/λcolor(white)(a/a)|)))" "#

where

#h =# Planck's constant and
#c =# the speed of light

We can rearrange this formula to get

#λ = (hc)/E#

This shows that the wavelength is inversely proportional to the energy: the smaller the amount of energy absorbed, the longer the wavelength.

So, we look for the transition that involves the smallest energy.

Energy Levels
(Adapted from Chemistry LibreTexts)

We see from the energy level diagram that the energy levels get closer together as #n# increases.

This, the smallest energy and the longest wavelength is associated with the #n = 7 → n = 8# transition.

I tried to mark it with an arrow in the diagram, but the lines are so close together that all you can see is the red triangle of the arrowhead.

.

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