Question : Identify the sealed glass vacuum tube containing an electron beam that is focused on a phosphor-coated glass screen when light is emitted.
Option 1: Cathode ray tube
Option 2: Flat array tube
Option 3: Light Emitting Diode tube
Option 4: Liquid Crystal Display tube
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Correct Answer: Cathode ray tube
Solution : The correct option is a Cathode ray tube .
The sealed glass vacuum tube you are describing is commonly known as a Cathode Ray Tube (CRT). In a CRT, an electron beam is generated at the cathode and is focused using electromagnetic fields as it travels toward the phosphor-coated glass screen. When the electron beam strikes the phosphor coating, it causes the emission of light, which forms the images on the screen.
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