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Question
Fluorescence occurs when
Options:
A .  a molecule returns to the electronic ground state from an excited singlet state by losing it's excess energy as a photon
B .  a molecule returns to the electronic ground state from an excited triplet state by losing it's excess energy as a photon
C .  None of these
D .  a molecule lowers its vibrational energy by losing it's excess energy as a photon
Answer: Option A

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