Fluorescence occurs when ____
a. a high-energy electron returns to its ground state by releasing energy in a photon
b. a low-energy electron moves to a high-energy state by absorbing heat
c. a high-energy electron leaves its nucleus and moves to a different molecule
d. a pigment molecule accepts a high energy electron and releases a photon of energy
e. the energy from an electron is transferred to a different molecule while the electron returns to the ground state
ANSWER: a
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