Cathode Ray Tube: Electron Source & Ionization

In summary, a cathode ray tube (CRT) is a vacuum tube that uses an electron gun to produce a beam of electrons, which are then focused and deflected onto a phosphorescent screen to create an image. The CRT produces electrons through thermionic emission and ionizes gas molecules through electron impact ionization. Some advantages of using a CRT as an electron source include its long lifespan and ability to produce a high-intensity, focused beam. While CRTs were widely used in older technologies, they are still used in specialized applications such as oscilloscopes, medical imaging equipment, and particle accelerators.
  • #1
cragar
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When my Tv shoots electrons from the cathode ray tube , where do these electrons come from and is it ionizing whatever they come from.
 
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  • #2
cragar said:
When my Tv shoots electrons from the cathode ray tube , where do these electrons come from and is it ionizing whatever they come from.

The came from a filament. The electrons are ejected via thermionic emission.

It is not ionizing for the filament. The filament is connected to ground.

Zz.
 
  • #3
ok thanks for the answer , so then are the electrons cycled back through the circuit somehow
 

1. What is a cathode ray tube (CRT)?

A cathode ray tube is a vacuum tube that uses an electron gun to produce a beam of electrons, which are then focused and deflected onto a phosphorescent screen to create an image.

2. How does a CRT produce electrons?

A cathode ray tube uses a heated cathode to emit electrons through thermionic emission. These electrons are then accelerated towards a positively charged anode, and focused into a narrow beam by a series of charged plates.

3. How does a CRT ionize gas molecules?

When the electron beam from a CRT collides with gas molecules, it can transfer energy to the molecules, causing them to become ionized. This process is known as electron impact ionization and is used in CRT displays to create glowing colors on the screen.

4. What are the advantages of using a CRT as an electron source?

CRTs have a long lifespan and can produce a high-intensity, focused beam of electrons. They are also relatively inexpensive compared to other electron sources and can be easily replaced or repaired.

5. What are the applications of CRTs?

CRTs were widely used in old television sets and computer monitors, but have since been replaced by newer technologies. However, they are still used in some specialized applications, such as oscilloscopes, medical imaging equipment, and particle accelerators.

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