Exam-style question
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What is thermionic emission?.
- A.The release of electrons from a metal when heated
- B.The absorption of energy by electrons in a metal
- C.The movement of electrons in a vacuum
- D.The deflection of electrons in a magnetic field
Model answer
What a good answer should say
- The release of electrons from a metal when heated
Explanation
Why this works
Thermionic emission refers to the process where electrons are emitted from a metal surface when it is heated sufficiently. This occurs because the thermal energy provides the electrons with enough energy to overcome the work function of the metal.
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