What is the light production mechanism inside a fluorescent tube?

Prepare for the GFA Lighting and Electric Test with flashcards and multiple choice questions, each question enriched with hints and explanations. Ensure success on your exam!

Multiple Choice

What is the light production mechanism inside a fluorescent tube?

Explanation:
Fluorescent tubes produce light through fluorescence: an electric discharge excites mercury vapor inside the tube, which emits ultraviolet photons. Those UV photons are absorbed by a phosphor coating on the inner surface of the glass, and the phosphor re-emits the energy as visible light. The coating isn’t heated to emit light; it glows because it fluoresces when struck by UV radiation. The mercury discharge provides the UV energy, and the phosphor coating determines the visible color and quality of the light.

Fluorescent tubes produce light through fluorescence: an electric discharge excites mercury vapor inside the tube, which emits ultraviolet photons. Those UV photons are absorbed by a phosphor coating on the inner surface of the glass, and the phosphor re-emits the energy as visible light. The coating isn’t heated to emit light; it glows because it fluoresces when struck by UV radiation. The mercury discharge provides the UV energy, and the phosphor coating determines the visible color and quality of the light.

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