Test: Electron Emission - UPSC MCQ

Electron emission involves the release of electrons, while electron capture involves the capture of an electron by an atomic nucleus.

Thermionic emission refers to the emission of electrons from a metal surface due to heat.

The minimum amount of energy required to remove an electron from the surface of a metal is called the work function.

The photocurrent in the photoelectric effect depends on the frequency, intensity, and wavelength of the incident light.

Semiconductors exhibit a negative temperature coefficient of resistance, meaning their resistance decreases with increasing temperature.

Thermionic emission occurs due to the heat energy supplied to a metal, which causes the emission of electrons.

Field emission is based on the quantum tunneling of electrons through a potential barrier.

Cathode ray tubes use thermionic emission to generate electrons for producing a beam of electrons.

Secondary emission refers to the process of electron emission from a solid surface when it is bombarded with high-energy electrons.

The emission of electrons from a metal surface when exposed to light is known as the photoelectric effect.

The intensity of the incident light does not affect the occurrence of the photoelectric effect.

The work function is the minimum energy required to remove an electron from an atom or a solid surface.

Electron capture involves the capture of an electron by an atomic nucleus.

Field emission is the process of electron emission due to the application of an electric field.

The photoelectric effect occurs instantaneously, without any time delay.

Halogens have the highest electron affinity among the given options.

The emission of electrons from a metal surface when bombarded with high-energy photons is known as the photoelectric effect.

The work function is independent of the frequency of the incident light.

Secondary emission refers to the process of electron emission due to the impact of high-energy electrons.

Copper has a higher work function compared to sodium, silver, and platinum.