MDCAT Physics MCQ #314

MDCAT Physics MCQ #314

1. Question 1

   Q1. How does the Franck-Condon principle relate to electronic transitions?

   • A) Molecules absorb photons only when vibrations match initial states.
   • B) Electron transitions require synchronized nuclear motion.
   • C) Photon absorption increases vibrational energy directly.
   • D) Spin states determine electronic transition probabilities.

   Answer: Molecules absorb photons only when vibrations match initial states.

   Explanation: Vibrational overlap determines transition probabilities. Option C ignores the coupling between electronic and vibrational states.