Electron Emission | MCQs

Explanation

Thermionic emission is the process by which electrons are emitted from a hot metal surface.

This occurs when a metal is heated to a high temperature, causing the electrons to gain enough energy to escape from the metal's surface.

This process is also known as thermal electron emission or Edison effect.

Explanation

A cathode ray is a stream of electrons that are emitted from a cathode (negative electrode) in a vacuum tube.

These electrons carry a negative charge, as they are negatively charged particles.