The light given off by the phosphor during exposure to the electron beam is known as

  1. Fluorescence
  2. Phosphorescence
  3. Persistence
  4. Retracing

Answer (Detailed Solution Below)

Option 1 : Fluorescence

Detailed Solution

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The correct answer is Fluorescence.

Key Points

  • Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation.
    • It is a form of luminescence.
    • In a cathode ray tube (CRT) or other similar devices, when the phosphor coating is struck by the electron beam, it emits visible light through the process of fluorescence.
    • This emission of light occurs almost instantaneously with the exposure to the electron beam.
    • Fluorescence ceases almost immediately when the excitation source (electron beam) is removed.
    • This characteristic makes it suitable for applications requiring quick response times.

Additional Information

  • Phosphorescence, on the other hand, involves a delayed emission of light and continues to glow even after the excitation source is removed.
  • Persistence refers to the duration the screen continues to emit light after the electron beam has moved on.
  • Retracing is the process where the electron beam returns to the beginning of the next line or frame in a CRT display.
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