Which of the transitions in the hydrogen atom energy-level diagram shown here requires the longest wavelength photon?
A)a
B)b
C)c

Question

Which of the transitions in the hydrogen atom energy-level diagram shown here requires the longest wavelength photon? 
A)a 
B)b 
C)c

Quizplus · Accepted Answer

The transition from level 3 to level 2 (C) requires the longest wavelength photon because it has the lowest energy difference between the levels. This means that the photon must have a lower frequency and longer wavelength to supply the energy needed for the transition.

Which of the Transitions in the Hydrogen Atom Energy-Level Diagram