Origin of Particles:
* Cathode: The particles originate at the cathode, which is the negatively charged electrode in the tube. The cathode is typically made of a metal like tungsten or nickel.
What the Particles Move Toward:
* Anode: The particles are accelerated towards the anode, the positively charged electrode. The anode is usually a metal plate or a screen coated with a fluorescent material.
Nature of the Particles:
* Electrons: The particles in a cathode ray tube are electrons, which are negatively charged subatomic particles.
How it Works:
1. Heating the Cathode: The cathode is heated to a high temperature, causing electrons to "boil off" its surface due to thermionic emission.
2. Electric Field: The electric field between the cathode and anode creates a force that accelerates the electrons towards the anode.
3. Focus and Deflection: Electromagnetic coils or plates can be used to focus and deflect the electron beam. This allows for manipulation of the beam's path and the creation of images on the screen.
4. Fluorescent Screen: When the electrons strike the fluorescent material on the screen, they excite the atoms, causing them to emit light. This is how images are formed in a CRT.
In summary: Electrons originating from the heated cathode are accelerated towards the anode in a cathode ray tube. The beam of electrons can be manipulated to create images on a fluorescent screen.
