Fluorescence occurs when

Question

Options:

A . a molecule returns to the electronic ground state from an excited triplet state by losing it's excess energy as a photon

B . a molecule returns to the electronic ground state from an excited singlet state by losing it's excess energy as a photon

C . a molecule lowers its vibrational energy by losing it's excess energy as a photon

D . none of the above

Answer: Option B

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