The electrons in a cathode-ray tube are produced by?
PHYSICS
WAEC 2021
The electrons in a cathode-ray tube are produced by?
- A. heating a metal filament.
- B. ionization of the air.
- C. applying a magnetic field to the y-plates.
- D. applying an electric field to the x-plates.
Correct Answer: A. heating a metal filament.
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