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Whereas, the photo-emitted electrons possess definite amount of initial kinetic energy.
K.E. of e = hf - WorkFunction
See, the initial k.e. is not neglectable.
Thermionic emission involves the release of electrons from a heated material, while photoelectric emission involves the release of electrons from a material exposed to light. Thermionic emission is dependent on temperature, while photoelectric emission is dependent on the frequency of the incident light. Both processes involve the emission of electrons, but they are triggered by different stimuli.
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What is thermionic thermometer?
A thermionic thermometer uses the thermionic emission of electrons from a heated filament to measure temperature. When the temperature increases, the emission of electrons also increases, allowing for a correlation between temperature and electron emission. These thermometers are used in high-temperature applications and can provide fast response times.
What is the difference between field emission and photoelectric emission?
Field emission occurs when electrons are emitted from a surface due to a strong electric field, while photoelectric emission happens when electrons are emitted from a surface due to the absorption of photons. Field emission is primarily influenced by the local electric field strength, whereas photoelectric emission depends on the energy and intensity of incident photons.
What is the time lag between the arrival of light at a metal surface and the emission of photoelectron?
The time lag between the arrival of light at a metal surface and the emission of a photoelectron is extremely short, typically on the order of a few femtoseconds (10^-15 seconds) to tens of femtoseconds. This process is known as the photoelectric effect, where electrons are emitted from a material when it absorbs photons with sufficient energy to overcome the material's work function.
When matter is irradiated by xrays what type of radiation is produced?
When matter is irradiated by X-rays, it can produce secondary radiation such as Compton scattering, photoelectric effect, or pair production. These processes involve interaction between the X-rays and the atoms in the material, leading to the emission of secondary radiation.
What is the relationship between frequency and kinetic energy in photoelectric effect?
In the photoelectric effect, increasing the frequency of incident light increases the kinetic energy of the emitted electrons. This is because higher frequency light photons carry more energy, which can be transferred to the electrons during the photoelectric effect.
What are the differences between thermionic emission and evaporation?
Thermionic emission occurs when electron leaves the surface of metals while evaporation occur in liquid when strong electron gain energy and escape the liquid surface in gaseous form
What is thermionic thermometer?
A thermionic thermometer uses the thermionic emission of electrons from a heated filament to measure temperature. When the temperature increases, the emission of electrons also increases, allowing for a correlation between temperature and electron emission. These thermometers are used in high-temperature applications and can provide fast response times.
What is the difference between field emission and photoelectric emission?
Field emission occurs when electrons are emitted from a surface due to a strong electric field, while photoelectric emission happens when electrons are emitted from a surface due to the absorption of photons. Field emission is primarily influenced by the local electric field strength, whereas photoelectric emission depends on the energy and intensity of incident photons.
Which statement best describes the light that will cause emission of electrons from a given metal through the photoelectric effect?
The light must consist of photons with energy equal to or greater than the work function of the metal to cause the emission of electrons through the photoelectric effect. The intensity of the light does not play a significant role in the emission of electrons, only the energy of individual photons matters.
How does the sensor control smoke detector?
The smoke detectors use the photoelectric effect or a sensor based on the ionization differences between smoke and air.
What is the difference between electrons and thermions?
free electrons drift away from atom's outermost shell because of loose force of attraction. but thermions are forced out of atom by heat energy. free electrons are responsible for flow of electricity whereas thermions are responsible for thermionic emission.
What is the Difference between electrons and thermion?
free electrons drift away from atom's outermost shell because of loose force of attraction. but thermions are forced out of atom by heat energy. free electrons are responsible for flow of electricity whereas thermions are responsible for thermionic emission.
What are the major differences between the muscle cars from the 50's and the cars now?
The most prominent difference would be the gas emission laws... it is quite amazing how dealerships can still make cars as fast as they are, with the emission laws getting stricter by the year.
What is the time lag between the arrival of light at a metal surface and the emission of photoelectron?
The time lag between the arrival of light at a metal surface and the emission of a photoelectron is extremely short, typically on the order of a few femtoseconds (10^-15 seconds) to tens of femtoseconds. This process is known as the photoelectric effect, where electrons are emitted from a material when it absorbs photons with sufficient energy to overcome the material's work function.
What is difference between photoelectric sensor and proximity sensor?
photoelectric sensor-sense both metal & non-metal proximity sensor -sense metal only
When matter is irradiated by xrays what type of radiation is produced?
When matter is irradiated by X-rays, it can produce secondary radiation such as Compton scattering, photoelectric effect, or pair production. These processes involve interaction between the X-rays and the atoms in the material, leading to the emission of secondary radiation.
What is the most common interaction that occurs between x-rays and bone tissues?
Photoelectric
