Here's a breakdown of the process:
* Negative Electrode (Cathode): This electrode is heated, usually by passing a current through a filament.
* Thermionic Emission: The heat causes electrons to gain enough energy to escape from the surface of the cathode, creating a cloud of free electrons.
* Electric Field: A positive voltage is applied to the other electrode (the anode), creating an electric field that accelerates the electrons towards the anode.
* Low Pressure Gas: The low pressure ensures that electrons can travel a significant distance without colliding with gas molecules.
Key Points:
* Cathode rays are negatively charged.
* They travel in straight lines.
* They can be deflected by magnetic and electric fields.
* They cause certain materials to fluoresce.
* They can be used in various applications, including television sets, X-ray tubes, and electron microscopes.
Let me know if you have any other questions!
