Which of the transitions in the following hydrogen atom energy-level diagram involves the shortest wavelength photon?

Question

Quizplus · Accepted Answer

The transition from energy level 4 to energy level 2 (transition a) involves the shortest wavelength photon and therefore the highest frequency and energy. This is because the energy of a photon is directly proportional to its frequency, and inversely proportional to its wavelength (E = hf = hc/λ).

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