Thermoionic Emissions

What is thermionic emission and how does it occur?

• Thermionic emission is the release of electrons from a heated material due to thermal energy.
• Thermionic emission occurs only in vacuum conditions without any heat.
• Thermionic emission is the absorption of electrons by a cooled material.
• Thermionic emission is the process of generating electricity from magnetic fields.

How are charged particles, such as electrons, deflected in an electric field?

• Electrons are deflected opposite to the direction of the electric field, towards a positive plate.

• Electrons are deflected in the same direction as the electric field, towards a negative plate.

• Electrons are not affected by electric fields.
• Electrons move in a straight line regardless of the electric field.

How can we deduce that the particles emitted during thermionic emission are electrons?

• The particles emitted are not affected by magnetic field.

• The particles emitted are repelled by a positive charged sphere

• The particles emitted are attracted towards a north pole

• The emitted particles are negatively charged, as shown by their deflection toward positive electrodes in electric fields.

What is the difference between electron current and conventional current?

• Electron current flows from negative to positive, while conventional current flows from positive to negative.
• Electron current flows from positive to negative, while conventional current flows from negative to positive.
• Both electron current and conventional current flow in the same direction.
• Conventional current is the flow of electrons, while electron current is the flow of protons.