Class 12 Exam > Class 12 Questions > Find the wrong statement.a)An electron gun is...
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Find the wrong statement.
- a)An electron gun is to create electrons and then accelerate them to a very high speed
- b)Thermionic emissions and photoelectric emissions are the same
- c)The kinetic energy of photoelectrons vary
- d)Vacuum tubes are thermionic devices
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Find the wrong statement.a)An electron gun is to create electrons and ...
Thermionic emissions and photoelectric emissions are not the same.
Thermionic emission is the emission of electrons from a heated metal surface. This happens when the metal surface is heated to a high temperature, which causes the electrons to gain enough energy to escape from the metal surface. This is used in vacuum tubes to create a flow of electrons from a heated cathode to a positively charged anode.
On the other hand, photoelectric emission is the emission of electrons from a metal surface when it is exposed to light. This happens when the energy of the photons in the light is greater than the work function of the metal, which is the minimum amount of energy required to remove an electron from the metal surface. This is used in photoelectric cells to convert light energy into electrical energy.
Therefore, option 'B' is the wrong statement as thermionic emissions and photoelectric emissions are not the same.
Thermionic emission is the emission of electrons from a heated metal surface. This happens when the metal surface is heated to a high temperature, which causes the electrons to gain enough energy to escape from the metal surface. This is used in vacuum tubes to create a flow of electrons from a heated cathode to a positively charged anode.
On the other hand, photoelectric emission is the emission of electrons from a metal surface when it is exposed to light. This happens when the energy of the photons in the light is greater than the work function of the metal, which is the minimum amount of energy required to remove an electron from the metal surface. This is used in photoelectric cells to convert light energy into electrical energy.
Therefore, option 'B' is the wrong statement as thermionic emissions and photoelectric emissions are not the same.
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Community Answer
Find the wrong statement.a)An electron gun is to create electrons and ...
No, thermionic emissions and photoelectric emissions are not the same. During thermionic emissions, the electrons are emitted from the metal surface by providing heat energy, whereas, during photoelectric emission light energy is emitted when electrons are emitted from the surface of the metal. So, it is the opposite in operation.
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Find the wrong statement.a)An electron gun is to create electrons and then accelerate them to a very high speedb)Thermionic emissions and photoelectric emissions are the samec)The kinetic energy of photoelectrons varyd)Vacuum tubes are thermionic devicesCorrect answer is option 'B'. Can you explain this answer?
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Find the wrong statement.a)An electron gun is to create electrons and then accelerate them to a very high speedb)Thermionic emissions and photoelectric emissions are the samec)The kinetic energy of photoelectrons varyd)Vacuum tubes are thermionic devicesCorrect answer is option 'B'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Find the wrong statement.a)An electron gun is to create electrons and then accelerate them to a very high speedb)Thermionic emissions and photoelectric emissions are the samec)The kinetic energy of photoelectrons varyd)Vacuum tubes are thermionic devicesCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Find the wrong statement.a)An electron gun is to create electrons and then accelerate them to a very high speedb)Thermionic emissions and photoelectric emissions are the samec)The kinetic energy of photoelectrons varyd)Vacuum tubes are thermionic devicesCorrect answer is option 'B'. Can you explain this answer?.
Solutions for Find the wrong statement.a)An electron gun is to create electrons and then accelerate them to a very high speedb)Thermionic emissions and photoelectric emissions are the samec)The kinetic energy of photoelectrons varyd)Vacuum tubes are thermionic devicesCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12.
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