Emission occurs only when electrons get transferred from the outer orbit to the inner one (higher energy level to lower energy level).
Absorption is when electron moves from inner orbit to outer orbit.
The transition from 4 to 2 and 2 to 1 is emission.
On the other hand, the transition from 1 to 3 or 2 to 3 or 3 to 4 is absorption.
A large energy difference between orbits implies that the frequency is large and the wavelength is shorter.
For this question consider the figure to the right shows an energy level diagram for a certain atom (not hydrogen). Several transitions are shown and are labeled by letters.
a.) Which transition corresponds to the absorption of the photon with the longest wavelength?
b.) Which transition corresponds to the absorption of the photon with the shortest wavelength?
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