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In which case is electron emission from a metal not known?
- a)Illuminating a metal surface with suitable light
- b)Applying a very strong magnetic field to a metal
- c)Applying a very strong electric field to a metal
- d)Heating the metal sufficiently
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
In which case is electron emission from a metal not known?a)Illuminati...
The correct answer would be option B. Applying a very strong magnetic field.
Applying a very strong magnetic field to a metal we don’t know the electron emission.
Applying a very strong magnetic field to a metal we don’t know the electron emission.
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In which case is electron emission from a metal not known?a)Illuminati...
Electron emission
Generally, emission refers to a process by which any object becomes free. In the similar way, the process by which the free electrons becomes free from the metal and enters into the vacuum is called electron emission.
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In which case is electron emission from a metal not known?a)Illuminati...
Electron Emission from Metals
Electron emission from metals refers to the process where electrons are ejected from the surface of a metal due to various influences. There are several methods through which this occurs, but not all methods are effective for causing electron emission.
Common Methods of Electron Emission
- Illuminating a Metal Surface with Suitable Light
This method is known as the photoelectric effect. When light of sufficient energy strikes a metal surface, it can provide the energy needed for electrons to overcome the work function of the metal and be emitted.
- Applying a Very Strong Electric Field to a Metal
A strong electric field can cause field emission, where electrons are pulled out of the metal due to the intense electric force acting on them.
- Heating the Metal Sufficiently
When a metal is heated, thermal energy increases the kinetic energy of its electrons. If the temperature is high enough, some electrons can gain enough energy to escape the metal surface, a process known as thermionic emission.
Why Strong Magnetic Fields Do Not Cause Electron Emission
- Applying a Very Strong Magnetic Field to a Metal
Unlike electric fields, magnetic fields do not do work on charged particles directly. They can influence the motion of electrons but cannot provide the energy required to overcome the work function of the metal. Therefore, applying a strong magnetic field alone does not lead to electron emission from a metal.
In summary, electron emission occurs through light, strong electric fields, and heating, but not through strong magnetic fields, making option 'B' the correct answer.
Electron emission from metals refers to the process where electrons are ejected from the surface of a metal due to various influences. There are several methods through which this occurs, but not all methods are effective for causing electron emission.
Common Methods of Electron Emission
- Illuminating a Metal Surface with Suitable Light
This method is known as the photoelectric effect. When light of sufficient energy strikes a metal surface, it can provide the energy needed for electrons to overcome the work function of the metal and be emitted.
- Applying a Very Strong Electric Field to a Metal
A strong electric field can cause field emission, where electrons are pulled out of the metal due to the intense electric force acting on them.
- Heating the Metal Sufficiently
When a metal is heated, thermal energy increases the kinetic energy of its electrons. If the temperature is high enough, some electrons can gain enough energy to escape the metal surface, a process known as thermionic emission.
Why Strong Magnetic Fields Do Not Cause Electron Emission
- Applying a Very Strong Magnetic Field to a Metal
Unlike electric fields, magnetic fields do not do work on charged particles directly. They can influence the motion of electrons but cannot provide the energy required to overcome the work function of the metal. Therefore, applying a strong magnetic field alone does not lead to electron emission from a metal.
In summary, electron emission occurs through light, strong electric fields, and heating, but not through strong magnetic fields, making option 'B' the correct answer.
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In which case is electron emission from a metal not known?a)Illuminating a metal surface with suitable lightb)Applying a very strong magnetic field to a metalc)Applying a very strong electric field to a metald)Heating the metal sufficientlyCorrect answer is option 'B'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about In which case is electron emission from a metal not known?a)Illuminating a metal surface with suitable lightb)Applying a very strong magnetic field to a metalc)Applying a very strong electric field to a metald)Heating the metal sufficientlyCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In which case is electron emission from a metal not known?a)Illuminating a metal surface with suitable lightb)Applying a very strong magnetic field to a metalc)Applying a very strong electric field to a metald)Heating the metal sufficientlyCorrect answer is option 'B'. Can you explain this answer?.
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