The materil used to coat inside the face of CRT is ______________?
Correct answer: D. Phosphorous
- A. Carbon
- B. Sulphur
- C. Silicon
- D. Phosphorous
Explanation
The inside face of a CRT is coated with a phosphor material, which emits visible light when struck by the electron beam. The option says phosphorous, but it is evidently intended to mean phosphor.
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