Exam-style question
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Which of the following best describes the process of thermionic emission?.
- A.Electrons are absorbed by a metal when it is cooled
- B.Electrons are emitted from a metal due to thermal energy
- C.Electrons are deflected by magnetic fields
- D.Electrons are created from the metal atoms
Model answer
What a good answer should say
- Electrons are emitted from a metal due to thermal energy
Explanation
Why this works
Thermionic emission occurs when thermal energy provided by heating a metal allows electrons to gain sufficient energy to escape from the metal's surface, leading to their emission.
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