The light given off by the phosphor during exposure to the electron beam is…
2025
The light given off by the phosphor during exposure to the electron beam is known as
- A.
Fluorescence
- B.
Phosphorescence
- C.
Persistence
- D.
Retracing
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Correct answer: A
Answer: Fluorescence
Explanation: The light emitted by a phosphor while it is being excited by an electron beam is called fluorescence because it is emitted immediately during exposure.
Fluorescence — immediate emission of light during excitation; this is the correct term for the light given off while the electron beam is on.
Phosphorescence — delayed emission (afterglow) that continues after excitation stops; not the prompt light during exposure.
Persistence — refers to the duration of the emitted light (how long it lasts), not the name of the light emitted.
Retracing — unrelated to light emission; describes the return sweep of the electron beam in raster displays.
Therefore, fluorescence is the correct term for the light given off by the phosphor during exposure to the electron beam.
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