CUET Preparation Today
In a vacuum tube, the electrons are supplied by a heated cathode and the controlled flow of these electrons in vacuum is obtained by varying the voltage between its different electrodes. What is the purpose of vacuum ? |
to create a low pressure inside the tube to create a high pressure inside the tube to avoid collision between the air molecules and the electrons to avoid the electric discharge |
to avoid collision between the air molecules and the electrons |
Vacuum is required in the inter-electrode space; otherwise the moving electrons may lose their energy on collision with the air molecules in their path |
